About once per day, TextEdit starts showing dialogs like this when I try to open any file:  > **The document “test.txt” could not be opened. You don’t have permission.** > > To view or change permissions, select the item in the Finder and choose File > Get Info. They go away after I quit and reopen TextEdit. `system.log` always contains messages like this: 9/13/12 10:41:42.952 PM sandboxd[21081]: ([357]) TextEdit(357) deny file-read-data /Users/lauri/Desktop/test.txt 9/13/12 10:41:55.118 PM TextEdit[357]: NSFileVersion tried to tried to add a new generation and failed. Versioned file URL: file://localhost/Users/lauri/Notes/temp.txt, contents URL: file://localhost/Users/lauri/Notes/temp.txt.sb-de6477ff-BhVNrq, error: Error Domain=GSLibraryErrorDomain Code=1 "The operation couldn’t be completed. (GSLibraryErrorDomain error 1.)" 9/13/12 10:41:55.118 PM TextEdit[357]: NSDocument failed to preserve the old version of a document. Here's the error: Error Domain=GSLibraryErrorDomain Code=1 "The operation couldn’t be completed. (GSLibraryErrorDomain error 1.)" 9/13/12 10:41:55.119 PM TextEdit[357]: <Document: 0x7f971d00a510>: An error occurred while attempting to preserve the backup file at file://localhost/Users/lauri/Notes/temp.txt.sb-de6477ff-BhVNrq: Error Domain=GSLibraryErrorDomain Code=1 "The operation couldn’t be completed. (GSLibraryErrorDomain error 1.)" I also have to delete the backup files (like `temp.txt.sb-de6477ff-BhVNrq`) manually later. I don't know if it's related to [Apps occasionally start showing "The document could not be autosaved" dialogs](http://apple.stackexchange.com/questions/50760/apps-occasionally-start-showing-the-document-could-not-be-autosaved-dialogs), but that stopped happening for me on Mountain Lion. I've tried repairing permissions after starting up from the recovery partition. TextEdit's code signature is valid. I haven't seen the dialogs in other applications, but that might be because I don't use other document-based sandboxed applications that much.