We are experiencing internal server errors when we try to delete groups of 3-4 or more posts at a time within large threads (not so helpful screenshot attached ). The particular threads I have tested/seen this in are in the range of 70,000+ post threads and after looking into the php error log we found that the errors from these all seem to be memory related. On two lines within the Zend Mysqli library: Code: [25-Jul-2011 21:15:29] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 128 bytes) in /blahblah/forums/library/Zend/Db/Statement/Mysqli.php on line 304 [25-Jul-2011 21:15:31] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes) in /blahblah/forums/library/Zend/Db/Statement/Mysqli.php on line 294 (In total we have somewhere around 10K errors of these two types over the past few days, though they are not all related to the delete functionality certainly. We aren't sure where they are also being triggered.) We have also seen some reports that alerts for the thread might not be working in addition, but I haven't seen any errors that I can see for certain are related to this as of yet.