Yes, it is basic stuff and yes it was tested. I just tested it again and paste and subtract with labels appears to be working correctly.
Is this in the V7 software or the V8 Beta software?
Which exact version of the software are you using?
Can you send me the tune file that you are using and the steps to reproduce the copy/paste problem?
Note: You should log these types of issues via our help desk system so it can be tracked and managed until it is resolved.
https://service.efilive.com/new-ticket
Regards
Paul