The issue is that on the main page i get the notice about a undefied value for countOnPage... and it was driving me nuts because i normally run my site with debug on while im developing.
anyway i think this is the fix, it seems to work..
ow_system_plugins/base/bol/comment_service.php
approx line 442
inside the foreach loop you will see this code
//old code
/* $entitiesForList[] = array('entityType' => $item['entityType'], 'entityId' => $item['entityId'], 'countOnPage' => $resultArray[$item['entityType']][$item['entityId']]['countOnPage']);
*/
this is the new code
//new code
$entitiesForList[] = array('entityType' => $item['entityType'], 'entityId' => $item['entityId'], 'countOnPage' => $resultArray[$item['entityType']][$item['entityId']]['commentsCount']);
basically i changed countOnPage to commentsCount in the last element of the array because there is no countOnPage in that array.
Hope that helps the devs make quick work of the fix.
Dave