After "upgrading" to 2.01, I have spent about 25 hours trying to get everything on my mildly customized blogs to work, and I'm in "500 Internal Service Error" land. Ironic thing was I recommended Wp to a client yesterday, I will be looking for another solution now.
I have it so folks can see my blog, but I cannot add an entry which, get this, has any hyperlinks in it. But who would want those in a blog?
My problem is I have zero interest in trouble-shooting this, and my clients cannot afford to pay me to do so on their dime.
I switched from Movable Type to WP a long while ago but I'm going to consider moving back. As a programmer, seeing a 500 error on a simple database write tells me that the code can't be all that robust. Upgrading to 1.5 was painful but doable; upgrading to 2.0 was/is horrific and I cannot see a feature worth the pain. Yeah, prettier text editing box--I can live without it.
Maybe for future reference you guys can simply say the truth: Your old blog is not likely to work in the new version, please start from scratch. And, oh yeah, no hyperlinks in your text, please.
This is a straight-up install with all plugins disabled.