diff --git a/config_selector.py b/config_selector.py
index 132240b..667fa71 100755
--- a/config_selector.py
+++ b/config_selector.py
@@ -406,9 +406,19 @@ def draw_menu(stdscr, selector: ConfigSelector, selected_idx: int, view_mode: st
 def add_prefix_dialog(stdscr):
     """Show dialog to add a new prefix."""
     h, w = stdscr.getmaxyx()
-    dialog_h, dialog_w = 5, 50
-    dialog_y = (h - dialog_h) // 2
-    dialog_x = (w - dialog_w) // 2
+
+    # Safety checks for minimum terminal size
+    min_h, min_w = 7, 20
+    if h < min_h or w < min_w:
+        return ""  # Terminal too small
+
+    dialog_h, dialog_w = min(5, h - 2), min(50, w - 4)
+    dialog_y = max(0, (h - dialog_h) // 2)
+    dialog_x = max(0, (w - dialog_w) // 2)
+
+    # Final safety check
+    if dialog_h <= 0 or dialog_w <= 0 or dialog_y < 0 or dialog_x < 0:
+        return ""
 
     # Draw dialog box
     dialog_win = curses.newwin(dialog_h, dialog_w, dialog_y, dialog_x)
@@ -416,8 +426,9 @@ def add_prefix_dialog(stdscr):
     dialog_win.addstr(1, 2, "Enter new prefix (ESC or empty input to cancel):")
     dialog_win.refresh()
 
-    # Input field
-    input_win = curses.newwin(1, dialog_w - 6, dialog_y + 2, dialog_x + 3)
+    # Input field - ensure it fits within the dialog
+    input_w = max(1, dialog_w - 6)
+    input_win = curses.newwin(1, input_w, dialog_y + 2, dialog_x + 3)
     input_win.clear()
 
     # Setup input mode
@@ -465,14 +476,29 @@ def add_prefix_dialog(stdscr):
 def confirm_dialog(stdscr, message):
     """Show a confirmation dialog."""
     h, w = stdscr.getmaxyx()
-    dialog_h, dialog_w = 5, 50
-    dialog_y = (h - dialog_h) // 2
-    dialog_x = (w - dialog_w) // 2
+
+    # Safety checks for minimum terminal size
+    min_h, min_w = 7, 20
+    if h < min_h or w < min_w:
+        return False  # Terminal too small, default to cancel
+
+    dialog_h, dialog_w = min(5, h - 2), min(max(50, len(message) + 4), w - 4)
+    dialog_y = max(0, (h - dialog_h) // 2)
+    dialog_x = max(0, (w - dialog_w) // 2)
+
+    # Final safety check
+    if dialog_h <= 0 or dialog_w <= 0 or dialog_y < 0 or dialog_x < 0:
+        return False
 
     # Draw dialog box
     dialog_win = curses.newwin(dialog_h, dialog_w, dialog_y, dialog_x)
     dialog_win.box()
-    dialog_win.addstr(1, 2, message)
+
+    # Truncate message if it's too long for the dialog
+    max_msg_len = dialog_w - 4
+    display_message = message[:max_msg_len] if len(message) > max_msg_len else message
+
+    dialog_win.addstr(1, 2, display_message)
     dialog_win.addstr(3, 2, "Press Y to confirm, any other key to cancel")
     dialog_win.refresh()
 
@@ -488,19 +514,34 @@ def choose_prefix_dialog(stdscr, selector: ConfigSelector):
     unmatched_prefixes = sorted(selector.unmatched_files.keys())
 
     if not unmatched_prefixes:
-        # Show message if no unmatched prefixes
-        message_win = curses.newwin(3, 40, (h - 3) // 2, (w - 40) // 2)
+        # Show message if no unmatched prefixes - ensure minimum window size
+        msg_h = min(5, h - 2)
+        msg_w = min(40, w - 4)
+        if msg_h < 3 or msg_w < 10:
+            return None  # Terminal too small
+        message_win = curses.newwin(msg_h, msg_w, max(0, (h - msg_h) // 2), max(0, (w - msg_w) // 2))
         message_win.box()
         message_win.addstr(1, 2, "No unmatched prefixes available.")
         message_win.refresh()
         message_win.getch()
         return None
 
-    # Calculate dialog dimensions
-    dialog_h = min(15, len(unmatched_prefixes) + 4)  # +4 for title, instructions, and border
-    dialog_w = 60
-    dialog_y = (h - dialog_h) // 2
-    dialog_x = (w - dialog_w) // 2
+    # Calculate dialog dimensions with safety checks
+    min_dialog_h = 6  # Minimum height for usable dialog
+    min_dialog_w = 30  # Minimum width for usable dialog
+
+    # Ensure we have enough terminal space
+    if h < min_dialog_h + 2 or w < min_dialog_w + 4:
+        return None  # Terminal too small
+
+    dialog_h = min(max(min_dialog_h, min(15, len(unmatched_prefixes) + 4)), h - 2)  # +4 for title, instructions, and border
+    dialog_w = min(max(min_dialog_w, 60), w - 2)
+    dialog_y = max(0, (h - dialog_h) // 2)
+    dialog_x = max(0, (w - dialog_w) // 2)
+
+    # Final safety check
+    if dialog_h <= 0 or dialog_w <= 0 or dialog_y < 0 or dialog_x < 0:
+        return None
 
     # Draw dialog box
     dialog_win = curses.newwin(dialog_h, dialog_w, dialog_y, dialog_x)
@@ -580,8 +621,12 @@ def select_individual_files_dialog(stdscr, selector: ConfigSelector, prefix: str
         action_text = "SPACE: Toggle selection | ENTER: Add selected | ESC: Cancel"
 
     if not files:
-        # Show message if no files
-        message_win = curses.newwin(3, 40, (h - 3) // 2, (w - 40) // 2)
+        # Show message if no files - ensure minimum window size
+        msg_h = min(5, h - 2)
+        msg_w = min(40, w - 4)
+        if msg_h < 3 or msg_w < 10:
+            return []  # Terminal too small
+        message_win = curses.newwin(msg_h, msg_w, max(0, (h - msg_h) // 2), max(0, (w - msg_w) // 2))
         message_win.box()
         message_win.addstr(1, 2, "No files available.")
         message_win.refresh()
@@ -594,11 +639,22 @@ def select_individual_files_dialog(stdscr, selector: ConfigSelector, prefix: str
     # Track selected files
     selected_files = set()
 
-    # Calculate dialog dimensions
-    dialog_h = min(20, len(files) + 5)  # +5 for title, instructions, pagination, and border
-    dialog_w = min(w - 4, 80)
-    dialog_y = (h - dialog_h) // 2
-    dialog_x = (w - dialog_w) // 2
+    # Calculate dialog dimensions with safety checks
+    min_dialog_h = 8  # Minimum height for usable dialog
+    min_dialog_w = 30  # Minimum width for usable dialog
+
+    # Ensure we have enough terminal space
+    if h < min_dialog_h + 2 or w < min_dialog_w + 4:
+        return []  # Terminal too small
+
+    dialog_h = min(max(min_dialog_h, min(20, len(files) + 5)), h - 2)  # +5 for title, instructions, pagination, and border
+    dialog_w = min(max(min_dialog_w, min(w - 4, 80)), w - 2)
+    dialog_y = max(0, (h - dialog_h) // 2)
+    dialog_x = max(0, (w - dialog_w) // 2)
+
+    # Final safety check
+    if dialog_h <= 0 or dialog_w <= 0 or dialog_y < 0 or dialog_x < 0:
+        return []
 
     # Draw dialog box
     dialog_win = curses.newwin(dialog_h, dialog_w, dialog_y, dialog_x)
@@ -722,11 +778,20 @@ def preview_yaml_cleaning(stdscr, content):
     """Show a simplified schematic preview of the YAML cleaning process."""
     h, w = stdscr.getmaxyx()
 
+    # Safety checks for minimum terminal size
+    min_h, min_w = 10, 30
+    if h < min_h or w < min_w:
+        return  # Terminal too small
+
     # Calculate preview window size
-    preview_h = min(12, h - 8)  # Smaller height
-    preview_w = min(70, w - 4)
-    preview_y = (h - preview_h) // 2
-    preview_x = (w - preview_w) // 2
+    preview_h = min(max(8, min(12, h - 8)), h - 2)  # Smaller height
+    preview_w = min(max(30, min(70, w - 4)), w - 2)
+    preview_y = max(0, (h - preview_h) // 2)
+    preview_x = max(0, (w - preview_w) // 2)
+
+    # Final safety check
+    if preview_h <= 0 or preview_w <= 0 or preview_y < 0 or preview_x < 0:
+        return
 
     # Create window
     preview_win = curses.newwin(preview_h, preview_w, preview_y, preview_x)
@@ -797,11 +862,22 @@ def confirm_yaml_cleaning(stdscr, selector):
         except Exception as e:
             # In case of error, just show a simple message
             error_msg = f"Error reading sample file: {str(e)}"
-            message_win = curses.newwin(3, min(len(error_msg) + 4, w - 4), (h - 3) // 2, (w - min(len(error_msg) + 4, w - 4)) // 2)
-            message_win.box()
-            message_win.addstr(1, 2, error_msg[:w-8])
-            message_win.refresh()
-            message_win.getch()
+            # Safety checks for window creation
+            if h >= 5 and w >= 20:
+                msg_h = min(3, h - 2)
+                msg_w = min(len(error_msg) + 4, w - 4)
+                if msg_w < 10:
+                    msg_w = min(20, w - 4)
+                msg_y = max(0, (h - msg_h) // 2)
+                msg_x = max(0, (w - msg_w) // 2)
+
+                if msg_h > 0 and msg_w > 0 and msg_y >= 0 and msg_x >= 0:
+                    message_win = curses.newwin(msg_h, msg_w, msg_y, msg_x)
+                    message_win.box()
+                    display_msg = error_msg[:msg_w-4] if len(error_msg) > msg_w-4 else error_msg
+                    message_win.addstr(1, 2, display_msg)
+                    message_win.refresh()
+                    message_win.getch()
 
     return confirm_dialog(stdscr, "Copy all matched files to config directory and remove UUID and _core?")
 
@@ -995,11 +1071,21 @@ def main(stdscr):
                         else:
                             # Show message that you can only select files from complete prefixes
                             h, w = stdscr.getmaxyx()
-                            message_win = curses.newwin(3, 60, (h - 3) // 2, (w - 60) // 2)
-                            message_win.box()
-                            message_win.addstr(1, 2, "Can only select files from complete prefixes.")
-                            message_win.refresh()
-                            message_win.getch()
+                            # Safety checks for window creation
+                            if h >= 5 and w >= 30:
+                                msg_h = min(3, h - 2)
+                                msg_w = min(60, w - 4)
+                                if msg_w < 20:
+                                    msg_w = min(30, w - 4)
+                                msg_y = max(0, (h - msg_h) // 2)
+                                msg_x = max(0, (w - msg_w) // 2)
+
+                                if msg_h > 0 and msg_w > 0 and msg_y >= 0 and msg_x >= 0:
+                                    message_win = curses.newwin(msg_h, msg_w, msg_y, msg_x)
+                                    message_win.box()
+                                    message_win.addstr(1, 2, "Can only select files from complete prefixes.")
+                                    message_win.refresh()
+                                    message_win.getch()
                     else:  # Unmatched view
                         # Find a matching prefix to add files to
                         target_prefix = None