Corrupted PreferencePanes Cache

Alex Harper, the author of the nice MenuMeters utility for MacOS X recently helped me solve a nagging problem: Sometimes newly installed PrefsPanes simply wouldn’t show up in the System Preferences. Turns out there’s a preference panes cache file that can become corrupt:

~/Library/Caches/com.apple.preferencepanes.cache

Deleting this file solves the problem.

Thanks, Alex!