I just updated to v9.03 yesterday, but this problem is unrelated to that, as far as I can tell.
The power blinked. I have a UPS/battery backup, but for some reason, the UPS beeped and shut down my system.
At the time, I was entering a new person.
On restart, I got the error message: "An error happened when opening the data tables."
TMG shut down. I restarted it, and it entered Repair Mode. It then recreated the indexes, and then gave me the same error message. (Repeated several times.)
Is there an external repair or validate utility I can run?