Forum Confused Navigation Manager
 

I have recently upgraded to 4.2 to get the navigation manager.
I have also tried upgrading VB Pro Garage to 3.0.9 and photopost classifieds to 5.22.

When I import their xml and have their buttons active, strange things happen to the navigation. I get an extra blank button, or the forums button gives an error:
Fatal error: Call to undefined function class_is_multimedia() in /home/teambuic/public_html/forums/forum.php(787) : eval()'d code on line 174

or the button links to activity.

I have been trying to fix this as if it were a problem other than vb, but as they both have a problem, it is possible it is in my vb?

Thanks