First, i want to thank you for the beta2 version, which includes the bugfix.
I have a test-server Till, so for me it is no problem to help you this way.
By testing new things first, we can avoid problems on production servers as much as possible.
So, for me it is important and for this reason i like to give it attention.
Here is my experience with ISPConfig 2.2.12 beta2:
The installation was ok, no errors.
ClamAV seems to work
The ISPConfig userinterface looks fine
And last but not least, you've fixed the bug within the forward function.
When i forward a domain to another location i.e. http://www.domain.com/~username
Thanks for your great support!!