I would guess you're using Onlinevideos version 2.3.2?
That would be hard to fix if so, but be patient, a new release is on its way and that opens up the possibilty to fix this
I forgot to mention that you can change the skin in use via the MP2 "Settings" panels (from within MP2 itself). This page in the MP2 Wiki explains how to do this and illustrates the alternative...