Hi @mircea.stefanescu 
,
This doesn’t look good but thankfully now we have a Sketchup wizard @oguzhan on our team! Currently, we are refactoring our Sketchup connector to make it as robust as possible. There were some issues with blocks on the latest release but we fixed them now (didn’t release it yet). If you can share the files you used, I’d be happy to test them myself and make sure they can be sent and received without any issues. I’ll keep you posted on this.
Great to see another Sketchup user here! Feel free to introduce yourself if you feel like it.
PS. You can share the files here or send me a DM.