That sounds strange. I'm not aware of any similar problem. Before I upload files here, I go through an extensive testing procedure. Therefore, I unfortunately can't provide a file on short notice. However, the .prg version can easily be saved as a .d64 file using a tool like DirMaster. Perhaps you could try that? In any case, thank you very much for narrowing down the problem. Do you experience the same issue with any of our other games on your machine?
Viewing post in Die Kaufmannsgilde (C64) comments
I'll have to give that a try as I wonder if the .d64 may work better. No thus far none of your other games have had this problem for me. Kaufmannsgilde has been my favorite so its gotten most of my time of them but I'll comment if any of the others have similar issues. My thought is that something about the .prg file doesn't load correctly with the way the C64U launches it from the emulated disk drive.