monline

It happens sometimes (eg. a forced quit -aka. kill- of an application) that a preference file (*.plist) gets damaged. As a result you might experience malfunctioning in the given app. There's a free GUI utility (Preferential Treatment) that's actually a wrapper for the OS builtin plutil command. The latter can detect syntax problems in your *.plist files and using the GUI you can scan all the system-wide and user preference files for errors. However you can do that with a simple (terminal) command too.

Executing the following two lines will list all the problematic files:

If you want, you can erase these files at the same time with a little modification:

I've added the -i option to the rm command in the above example so you've a little more control on which *.plist files get deleted (since nobody want's to blindly delete files).