These are two random things to be interconnected, I know, but here's what I've found: Whenever I "Delete All Backups" of a file in Time Machine the "Hot Keys" and Mighty Mouse buttons for Expose and Dashboard clear themselves. I no longer can click Button 3 on the mouse for Expose or Button 4 for Dashboard or F9, F10, F11 or F12 for their respective functions. It's a simple fix: I just go into the Expose/Spaces System Preference and re-set the buttons to what I want their functions to be, but it's still pretty annoying. I was having the problem of the buttons clearing themselves for a while and finally narrowed it down to that function of Time Machine that re-sets them. I've been able to replicate these results multiple times. Does anyone else have this problem? Can anyone else replicate this happening? I wanted to see if it's my system or if it's a bug overall. Thanks!