I am having this exact problem, too, @hnla. The same thing was happening awhile back, and somehow it was resolved… but now it’s back.
I am using WordPress 3.6.1 and BuddyPress 1.8.1
I have created a custom child theme to the bp-default. I have tried disabling my child theme, and the same issue persists.
I am unable to find a download for 1.8 to revert the registration.php page. (Found lots of information about 1.8, but not an actual download.)
THank you for your help.
(I am also happy to create a Trac ticket, but I’m not sure where/how to do that.)
