Having same issue on an event after confirmation of details when I click next get a page with error:
Fatal error: Method name must be a string in /home/content/[*** edited out as is site domain info]/html/web/components/com_dtregister/controllers/payment.php on line 104
PS> I had to get this registration event working so what i did was make a copy of the event and publish and test that one and it worked for me, at least for the one test I did. So, I hope it continues working. I wonder if, during one of the recent updates - if an event was built - it was not coded OK and with the latest update it does?
One thought here... I really appreciate all the updates but I do notice that often an update - while it may fix and/or improve somethings - often brings in other errors! I think releases should be checked more carefully. Thanks.