Vizard .exe file doesn't load (Vizard 3)

[Saule]

I'm working on a project where we need a vizard (3) application to be run on several different 'at-home' computers (only windows). At the moment, we have the problem that on some computers vizard doesn't start properly. The 'vizard is loading' bar appears just fine, and the .winviz process is running in the background but the program just doesn't show up. It doesn't happen on all computers, and on those where it does the original source code works just fine. (the .exe is made on a different destkop than the ones which have problems). Although I have the source code, it wasn't originally written by me so I don't know the code through and through.

I was wondering if anyone has ever heard of similar issues, or has any idea what the problem could be? I couldn't find an easily identifyable aspect which the different computers have in common, so I have no idea what's causing it.