I upgraded my blog and another blog to 2.7. I'm running the same plugins on both blogs, and the plugins show as compatible with 2.7 in the WordPress list. However, several of the plugins, on my blog, when activated break the Dashboard. At that point, everything on my Dashboard disappears except the QuickPress posting option. When I look at settings, all of the others are still checked--they just don't appear. The Dashboard appears blank except for the quick posting option. Clearly there's some issue with my blog that's causing this but I can't think what it could be, since the install is exactly the same.