Today one of my customers upgraded their APEX 4.0 to 4.2.1.00.08. The whole process was completed without any issues. After the upgrade there was only one problem we could notice. Our translated applications didn't work for the other languages then the primary language. Trying to run any of the translated applications would result in an internal error. The reason was that the image path wasn't there for any of the tranlations:
After entering the image path and repeating the neccessary translation steps everything worked well.