I'm getting a red dot on the top panel. On mouseover, it says "An error occurred, please run package manager from the right click menu... This usually means installed packages have unmet dependencies.
If I run package manager (from right click or terminal: sudo apt-get check), it says 0 packages broken.
The dot isn't there on log on. Update manager won't run from System menu, but runs fine from terminal: sudo update-manager
Package manager runs fine from menu.
Nothing seems to be wrong, it's just annoying.