Sorry Chris, I didn't see there was a reply.
I've gone through all the testing of conflicts, and that took quite a while as there seems to be two conflicts.
The first conflict, creating the spinning wheel is caused by BuddyPress. I'm not sure why that should be causing a conflict though, as it is supposed to be a replacement for the BuddyPress registration form.
The second conflict is caused by another plugin, and this doesn't cause a spinning wheel, it just causes the form to do nothing, much like the spinning wheel without the wheel, it does actually add the user.
This is the other plugin:
Posted 10 years ago on Thursday September 6, 2012 | Permalink