Fatal error when using Private Messaging
 

After upgrading to 3.8.4* my users and I cannot use PM's anymore.

We get the following message.....

Fatal error: Class 'vB_Postbit_Pm' not found in /home/content/xxxxxxx/html/Vbulletin/includes/class_postbit.php on line 115

Can anyone shed some light on this? I tried re-uploading class_postbit.php but that did not solve the issue.

Thanks in advance.