There's been a small core change dealing with the "quick" PM stats.  The PM status USED to be counted on the spot by checking the actual PM database.  For users with MANY PM's this could cause the forum to slow down.

Thus, what I did was exported the new count and total count to the actual members .dat file.  Now, the stats will be counted each time the member center is loaded (for populating all the counts there).  This could cause some problems though with the stats always being "up to date".  I would like everyone to make sure they are always up to date.  They will automatically be updated when the Member Center is loaded and they are out of sync with the main database.

Just be on the look out.