I am experiencing the same problem The fixed worked but every message i writ gets another warning;
Warning: array_key_exists() [function.array-key-exists]: The second argument should be either an array or an object in /home/meigtwoc/public_html/components/com_comprofiler/plugin/user/plug_cbprofilebook/classes/bbcode.inc.php on line 92
Ok I took a shot and commented out line 92 and it seems to have taken care of the warning message. My question is since my php is week can anyone back up that this a fix or not.
Without looking at the code I would guess that commenting out that line causes something to not happen as desired...
If the profile book plugin sees those errors with the CB Connector unpublished then I think it would be a profile book issue... so I would post something in the "General Plugins" forum regarding the issue.