Each time I visit the forums, I'm recognised as koolguru. I have to logout and login. On my very next visit I face the same problem.

Surprisingly, I've been facing the same problem at the FreeWebSpace.net forums and the weirdest thing is that even there I'm mis-interpreted as koolguru. Totally bizarre!

Is it a bug with vBulletin?

check your temporary internet files and make sure you havent got any cookies from WHT, if you have delete them all and try again.

i believe it is your isp proxy that called proxy transparant... whether you configure or not at your browser to use a proxy server .. your 80 (normally web connecction) is force to get thru their proxy server.. to save their bandwitdh or so or for other reason .. CMIW

sometimes.. you can press CTRL + F5 to get your browser ask the proxy to get new data .. but sometimes it doesn't help either :(

I guess you are right atiep. It seems to be my ISP.