Preview hangs when opening any image or pdf
Probably resetting Preview by deleting its configuration from ~/Library could solve that problem.

cd ~/Library
rm Caches/com.apple.Preview \
   Containers/com.apple.Preview \
   Preferences/com.apple.Preview.LSSharedFileList.plist\
   Preferences/com.apple.Preview.SandboxedPersistentURLs.LSSharedFileList.plist \
   "Saved Application State"/com.apple.Preview.savedState


Restart Preview and test.