msharpen mask option problem

I've been using the msharpen filter quite a bit
lately. Yesterday, I tried to use the "mask" option,
and the output was badly mangled. I didn't have time
to do any testing, but I suspect it is incompatible
with any resizing/rescaling options. The result looked
like what you get when you force incorrect input
geometry.

People targeting dvd output with high bitrate might be
interested in trying "-J msharpen=strength=20".