domain/forums/ to forums.domain
 

I switched forums mydomain.com/forums/ to forums.mydomain.com and now when i go into the admin and try to change the forum url i click submit and the page goes white/blank and doesnt save anything.

Some more info would assist here. Like is this a vb site? Have you changed the server paths in edit integration to point to vb if the server paths urls have changed? We only have a forum urls paths listed two places in forum settings and edit integration in admin.