It must be something to do with your authentication against vbull.

I tried demo/pass using the following url

http://nightmaresonwax.com/...user/login.cgi?t=wap and it gives invalid username passwd.

Similarly, t=brewt replaced with t=wap would give same error. It has to do with authentication and GT would be in a better position to answer that as i am not conversant with the vbull/gm combo

Sorry for not being of help on this

Anup