I'm having problems with widgets, specifically foursquare and doggcatcher.
After installing and adding the widget, when i reboot CM6 doesnt recognize the widget and says problem loading. If i delete the widget and try to re add it, FS or DC dont even show up in the widget list. The apps are in the drawer and work when opened.
Only fix is to uninstall and reinstall the apps and then the widgets will be in the widget list again and work properly.
Then the cycle happens again.
I put a clean CM6 final on after a wipe, etc.