Hi,
Not a big deal, but quite frustrating.
If I open a pdf with Acrobat X as maximised or normal, but covering the Dock to the edge of the screen. Then the dock will never come to the top when you move the cursor to the edge as it should. I have to move the Acrobat window or minimise it then use the dock. I have only noticed this with Acrobat Reader X nothing else and I use quite a lot of different applications.
Regards
Graeme