In my experience if ArchiCAD is acting up in very strange ways, your best bet is to contact support. Trying to work it out yourself or with the help of the userbase here, will result in many many hours time lost.
I am not familiar with how things work in other regions, but we have a paid subscription and that comes with free support from our reseller. So I call them if I run into problems and they in turn are my link to Graphisoft support if things are too complicated for them to fix for me.
Without wanting to accuse anyone posting on this topic so far: but if someone can't contact support for help, I suspect they did not acquire ArchiCAD through the ussual channels, so to speak.
If someone asks for tips with working in ArchiCAD, I'm more than happy to help, when I can find time to reply.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-26NED FULL
Windows 10 Pro
Adobe Design Premium CS5