any error that might occur on new user registration… clear the error log… register new user… anything in there?
dont worry about the usergroup page… I have resolved that display issue…
So something is interfering with new member registration… when you register, dont do anything afterwards… check the sfmembers table… is there an entry for the new user? sounds like not… which means the standard wp hooks are not getting fired for new member creation… which is quite odd since we know for a fact that wishlist does this…
also, we have special log in place for when a user visits the forum for the first time if the sfmembers entry for them does not exist it will be created… this is happening on your site…
so what is interfering with the registration? unsure… might be worth a quick test to disable your other plugins and try a registration.. same result? if so, then switch to default wp theme and try again… still same result? just trying to narrow down potential conflicts…
out of curiosity what is your wishlist setting for notifying admins about new registrations?