I have downloaded and installed this on a brand new forum and WP install. The site is running on full SSL (
https://). When I click login on the WP site, it sends me to vB4 to log in. Once I log in, it tries to redirect me back to the home page of WP, but instead of sending me to "https://www.yourdomain.com", it sends me to "http://www.yourdomain.com:443". This is not good, as so my browser explains it is a Bad Request.
All of my settings in vB4 and WP show https:// for anything needing a full URL.
edit: note it works in IE because IE automatically corrects it. Firefox and Chrome however don't, but they really shouldn't anyways.