Do ToolBoxes go bad? I have some toolboxes created at 10.0 that when I try to open crash ArcMap/ArcCatalog 10.1. At first I thought it was happening just with 10.0 toolboxes but now some of my 10.1 toolboxes crash AM/AC. All of this toolboxes contain python scripts and just one script per toolbox. Everything was working last week.