I get this error when trying to update spam blacklist:

Remote error: Invalid return payload: enable debugging to examine incoming payload (XML error at line 1, check URL) (2) 

and when I submit URLs to the list, this error:

	

    Remote error: Invalid return payload: enable debugging to examine incoming payload (XML error at line 1, check URL) (2)
    Failed to report abuse to b2evolution.net.

Enabling debugging doesn't show a cause that I can see. As it says its a remote error, I'm thinking it is something broken on b2evo's side.

Any chance of getting this fixed any time soon?

b2evo version: 2.4.2 (yes I know its old, but updating ruins my setup)
URL: http://www.a4at.com/blog/index.php/b/