BIMx viewer works fine for me. Is that what you're launching? (Applications > Graphisoft > BIMx Viewer > BIMx)
I could ask you to share your Console logs here, but it would probably be easier and faster for you to just phone US tech support and have them walk through the issue with you.
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.6, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB