I upgraded my WP1.5.2 blogs to WP2.0 on the day it was released, following the upgrade instructions to the letter, and everything ran fine for the first week or so.
In the past 4 days, however, I've received the following error twice on all the blogs I run when I try to access anything:
"Your database is out-of-date. Please upgrade."
If I follow the upgrade link, all is well again. But it strikes me as really, really strange, especially as it has popped up again after a few days.
Any thoughts? I can try reinstalling all the WordPress files again, but I'd rather not, if possible.