I've found that if I jump to the View I'm trying to export in IFC, and then refresh the 3D window prior to exporting, it typically works. I think it gives the system a chance to get the "Errors Occurred During the Last Operation" warning out of it's system, without interrupting the export.
Sometimes it still doesn't work, but if I sign out and back in, it's generally OK.
I've identified the rogue objects, but it is a part that my interior designers have used extensively (UniCabinet), and we've gone too far to remove it. It still shows up and exports fine, just with that error message. Some day when I have time, I'll dig through the GDL to try to fix the problem.
Chuck Kottka
Orcutt Winslow
Phoenix, Arizona, USA
ArchiCAD 25 (since 4.5)
Macbook Pro 15" Touchbar OSX 10.15 Core i7 2.9GHz/16GB RAM/Radeon Pro560 4GB