Wirelessly posted (BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/107)
I have a similar problem. This forum is fine, but on other forums it will give me "Incorrect username / password" when I try to login (yes I am entering the right information) or it directs me to a blank white screen which leads nowhere. I'm guessing the white screen might be a redirect page that doesn't execute. It's annoying especially since some of these problem forums are WAP enabled!