Steve - you have hit the nail on the head! The drive is not compressed, but when I went to delete the existing pgl files, I noticed that the Compress Contents, Encrypt, and Read Only attributes were set for every file in the folder. I've unset them, restarted CbB and the menus are back! It's not obvious to me why those attributes were set, and it seems interesting that Plug-in Manager doesn't seem to care, but CbB does. Space occasionally gets tight on the drive, so perhaps Windows automatically