Guys, first off, don't start a new general support thread here. Please make individual threads for your problems (or at least use the old general support thread). Thanks.
Regarding the non-hiding sound/video controls I have no idea. It works in the whole set.
The inventory window is not resizable.
Regarding the difficulty of clicking on group and raid windows, I unfortunately don't have a solution for you except using the default UI or another UI, which are larger.