Upgraded to Joomla 2.5.19. Now cannot configure payment methods.

[Allen_K]

After upgrading to Joomla 2.5.19, I can no longer create or edit payment methods in VM 2.0.26d. I have already tried analyzing and repairing my database, and reinstalling the latest versions (2.0.26d) of VM and VM AIO. Didn't help.

This is the screen I get when editing an existing payment method, or saving a new payment method. See screen capture image.

[attachment cleanup by admin]

[Milbo]

There is some fatal error, supressed by your error reporting settings. Would be interesting to know if it works with vm2.5.2

[Allen_K]

I temporarily enabled error reporting, and got this:

Fatal error: Class 'JElement' not found in [redacted]/public_html/administrator/components/com_virtuemart/elements/vmtitle.php on line 22

I am obviously not a programmer, so I do not know how to interpret this  . Any ideas on what I need to do to fix the issue?

[Milbo]

Sounds more like you updated to joomla 3.

[Allen_K]

But oddly, Joomla reports 2.5.19 at the bottom of every admin page.