I just upgraded 4 sites to 2.6 - with one small issue on this one.
The head tag (I might not be using the correct term here) for the home page is showing as the the name of one of my categories (specifically, 'The Comics of Little Carotte').
Also, on my sidebar the 'my category order' category scroll down has reverted to the default permalink structure for some of the categories and redirects to the home page.
My permalink setting is /%category%/%postname%/
I upgraded using instantupgrade.
I understand that there are bigger fish to fry at the moment - I just thought that it would be better to make the problem known now than to wait. I appreciate all of the work everyone has been doing. I'f this issue has already been covered - please just point me in the direction.