Static images: audio is rendered properly, but video is only rendered if there is movement. With movement I mean a videoclip, or draggable object while it is being dragged across the applet. Movement also seems to include scrolling the entire page.
Case studies from the MS silverlight site do not function at all, but media applets do.
Other applets, browsers other than firefox 15.0.1.
Scrolling the page seems to help sometimes, I set winecfg to windows 7, but am not sure whether that is necessary. I also installed several packages from winetricks: corefonts, comctl32 and vb6run. Other than dlls from those packages no native dll's were used.