I’ve checked the corrupted file, and it seem that styles, levels, and other non-geometry objects are fine, so the problem is related to geometry. Are you using copy & paste on the same document, or you are doing copy & paste between documents?
I’ll try to reproduce the problem by doing multiple copy/paste operations. If you have any hint about which curves or blocks do you usually copy, that would be helpful.
This seems like a bug when importing slabs from previous versions of VisualARQ, as slabs have been improved recently. I’ll take a look, I’ll create an slab with a very old version of VisualARQ and try to open it with VisualARQ 1.9.