Style bug
Not sure if I should trust where you left those screenshots, so I haven't looked at them. Does the issue you reported still exist? If so, can you make some screenshots visible in this thread?
I don't see any problem in either. If you see the sidebar pushed down in monobook, there is a bug for that (it's ok for me in your links, it's not very consistent an error).
In vector skin, the settings area is too small. Perhaps the typography update is the reason.
Ah, probably. I override it in my browser so I don't see a difference there, please report the problem in bugzilla and attach screenshots. As a workaround, my personal suggestion to everyone is to use monobook for the future. :)