import dwg in artlantis 6.5 problem

Recently I got a new computer. Now I have the problem that I cannot import .dwg files into artlantis studio 6.5.
It takes an endless time, so I interrupt the action.
I can open existing .atl files.
What could be the problem?

Thanks in advance for your help.

Could you, please, contact Abvent support, we need more info to help you with this issue.