I decided to clone my site and create a forms only site with no cache or compression to make things run better.
But on my cloned site, whenever I test out event registration I get an 500 error. The browser URL shows:
index.php?option=com_dtregister&controller=payment&task=methods&Itemid=377
It's after verifying and hitting submit, where you would be taken to the payment page if the event has a cost involved.
wbaccus - Sorry you didn't get a reply here before. I checked and I see no tickets from you. A serious issue should go towards a ticket. Anyway... tt_chatter DID submit a ticket and we checked it out. His problem was a failure to read the readme.txt file issue
He had installed our two JomSocial plugins but did not have JomSocial. One of the plugins was enabled... so it was trying to process the plugin after a successful registration.
Maybe you have done the same thing? If not that, it's probably something else setup related. You could set error reporting to maximum to see what else shows. If you can't find it, submit a ticket and we'd be happy to help. Thanks.