After creating either my 13th or 14th post in the Groupjive Wall tab, upon saving the last one I received a white screen. Any attempt to access that particular group results in the same white screen. If I disable the Wall tab in the Edit Group dialog, I can access the group normally.
Debug On, error reporting Max, I expected some fatal error to appear but the error log consistently logs the following php notice whenever I re-enable the Wall tab and try to access that group.
[19-Apr-2011 14:32:37] PHP Notice: Undefined variable: message in /home/...site.../components/com_comprofiler/plugin/user/plug_cbgroupjive/component.cbgroupjive.php on line 1652
Not a big deal for me right now as I can keep the wall disabled for that group

but I thought I'd mention it here in case it's meaningful.