I have to say, I knew there were differences between computers - and those differences were particularly great in the area of 3d graphics programming - but I never expected things to be this hard.
Tracing down problems is very hard when you don't have a computer to reproduce the bug...

If this is the first version with the loading screen, it's possible this is some sort of multithreaded-related bug. I'll see if I can test the older versions of Terrena to see what they have different and I'll also see if I can test the game on my other PC.
Actually, there is one more thing that can be tried, which is using the debug libraries instead of the ordinary ones(this can be changed in the dll.config files)
EDIT: Multi-threaded loading does seem to be the problem. It is now disabled by default(this can be changed in config.xml).
The new version includes a few extra bug fixes too.