First of all thank you for your help. Now to answer your questions. > I assume that you are using an 32 bit Nim installation?
Yes, but before that I used 64 bit. Differences invisible. > Is the chess game running for you? Yes, a couple of fixes and it worked. If you want I'll write more detailed. > If it really is Windows -- which gtk version, which windows, and how did you > install GTK3 itself? Windows 7 x64, gtk3 (3.20). Installed with Msys2. glib except int32 NEd compiled. But is not completely working. I'll try to fix it. Anyway, thank you again.