When we went from Plesk 8.01 to 8.1.1 (and from MySQL 4 - 5) we lost all the auto_increment fields in every database. I had to go back and manually re-do them. It was probably just a fluke, but was very time consuming none-the-less :smash:
Interesting. This usual happens after you downgrade from MySQL 5 back to 4 using mysqldump.
I never had any issue upgrading directly from MySQL 4 to 5, but I am using Debian
