dxfファイル保存ができない、CCライブラリが使用できない

Hello ​@純子藤96979815 

Thank you for the report. You've actually captured two separate issues here. 

DXF disappearing from Save As is a known issue and a ticket has been raised for it. 

CC Libraries not loading — this is another issue reported today. I have raised a ticket for that as well. 

Could you please share your exact Beta version, and system config details. Thank you for trying reinstall and cache clear already, that helps us narrow it down.