We attempted an upgrade from 15.7 SP122 to SP132 but we experienced a problem with trigger permissions.
Case :
Table A in DB1 has a trigger which fires a delete from Table B in DB2
All databases, tables and triggers are owned by user 1
After the upgrade to SP132, we updated table A and the trigger fails with
DELETE permission denied on object B, database DB2, owner dbo
We extracted the trigger definition from the database and reloaded it.
We ran the updated on table A again and the process was successful.
We have a few triggers and this didn't affect all of them so far so seems like a glitch somewhere.
We're due to try the upgrade on another server so we'll be able to test this before and after the upgrade.