Now when I logged out of my user account (not admin), I get this error:

ERROR: Unable to execute query

SELECT * FROM poll_question WHERE start_date<='2007-10-12' AND end_date>='2007-10-12' ORDER BY rand() limit 1
Got error 28 from storage engine
Refreshing did nothing - still got it. Closed the window and went back to the site from scratch - still got it. No idea what's up with this but I see no reason for it.

I tried to log in to admin control panel to delete the poll to see if that corrected the problem. This is the first time I tried to log in since the upgrade. I could not. Three times I entered my user name and password (no chance of mistyping). All three times I just got a message saying "You are not loged in." What kind of nonsense is that?

Seriously, if anyone out there is thinking about upgrading, I would reconsider. I personally wish I had stayed with version 2.4. I had already edited most of the bugs anyway, and at least that version worked right. This version is totally screwed, and it seems as though admin just abandoned this topic after sticking us with this stuff.