Quote Originally Posted by raphaelf
What is a build key?
It's a special string that you can assign to your Qt DLLs and plugins. When Qt loads a plugin it checks whether both keys are the same, but since you have never heard about it, you have probably probably left the default values, so it shouldn't be a problem.

Open libeay32.dll and libpq.dll in Dependency Walker and see if there are some DLLs missing. If it finds some, post them here.