Hey
Is there a reason why nspluginwrapper is installed by default on F15 i686? (AFAIR, this is true for F14 i686 aswell).
Once flashplugin is installed from adobe repo, nspluginwrapper and firefox causes flash video corruptions, artifacts on any website that uses heavy flash graphics.
As soon as nspluginwrapper is removed, there are no flash issues anymore.
I'm not sure if nspluginwrapper makes these issues only on i686 or it is itself problematic on x86_64 aswell.