Thank you for the question and I’m sorry to hear about the problem.
I assume that Archicad freezes during the publishing process and you have to force quit the application. Please be aware that publishing a 3D model is a heavy operation, which requires a lot of resources. To troubleshoot this issue please read this article and you can find more tips on this site. We generally advise to turn off the General Illumination (GI) if the publishing is stuck, you can find this function under the BIMx Export Options.
Let me know if you have any other questions, please use our official BIMx support channel firstname.lastname@example.org to answer.
Technical Support Engineer, Technical Support Team GRAPHISOFT SE, Budapest