I can't access my PMs. I get the following error:
Query execution was interrupted, maximum statement execution time exceeded
File: /var/app/current/Sources/PersonalMessage.php
Line: 728
Note: It appears that your database may require an upgrade. Your forum's files are currently at version SMF 2.0.15, while your database is at version 2.0.2. The above error might possibly go away if you execute the latest version of upgrade.php.
Thanks for reporting. One of the fixes I put in recently was having our database refuse any query > 10 seconds long. Not ideal but keeps problematic pages from affecting the whole site. If PMs are triggering it that's good to know and I'll see if I can figure out why.
One option might be archiving PMs before a certain date.
Does this happen consistently as soon as you access your PMs, or is it more intermittent / happens while viewing older messages etc?