As patrickw posted above, the upgrade does seem to work even though you get the error noted. I got a blank page when attempting to go to my blog page, but after clearing cache and cookies was able to get to the site page and the error about the presentation being “broken” (with the default being reverted to) went away.
I’m just starting to play with it and I like it a lot. Most everything seems to be working OK.
I did notice that the import page did not list MovableType as a blog to inport from, yet there is an mt.php page in the wp-admin/import directory (along with b2, GreyMatter, and LiveJournal).
When attempting to run the page (I had to paste: /wp-admin/admin.php?import=mt as the URL), I got the following error returned: “Warning: call_user_func(): First argument is expected to be a valid callback in /home/username/public_html/blog/wp-admin/admin.php on line 97” which is a comment.
Since I’m pretty much of a noob when it comes to prgramming I have not been able to decipher where the actual error is being thrown.