I'm still running RawTherapee 2.4.11 instead of version 3 or 4. This is simply because I find it a lot more easy to use and I still like the the more aggressive noise reduction in it.
After upgrading to Mint 14, I've received errors when trying to start it, errors like:
Gtk-WARNING **: Error loading theme icon 'text-x-generic' for stock: Fatal error reading PNG image file: Invalid IHDR data
The solution is quite simple, though not really trivial: update icon cache for fallback icon sets. This will do ( run it as root ):
for i in /usr/share/icons/*; do sudo gtk-update-icon-cache $i; done