hmm, I did make an account on a mac computer a while ago and then made another with the same name on my PC...
I don't think your issue is 0.8.0 related.
Maybe you would be better off to start a new thread in the Technical Support area:
https://bitsharestalk.org/index.php/board,45.0.html Someone there will see your situation and help you out.
You should give as much information as possible, such as
- is the same account name registered in one wallet and not registered in the other?
- did you import your backup from the Mac to the PC?
- did you already collect some vested balances in the account on the MAC?
- anything else you can think of about your situation.
I'm sure that someone will have the solution for you. Good luck