Thank you.
I have tried to reproduce the error again and i found the problem.
Yes, the problem has the error on the screen, but didn't rollback the creation things.
I have used r00t as first user, and get a invalid name. (home not created, named files created, quotas not set, vhost created with FAIL cuz no directory is present). The second test i was using user porky and all was okey.
So, if you supply an invalid name you got a huge fail, you put down your httpd server and you have to manually dig on the vhost/named files to fix them. I have not see a list of invalid users and i guess that is handled on Linux not on the CWP. You have to check for the Unix user blacklist then do not proceed with bad parameters.
That's all.
Please fix your user creation script