I came across a WMV movie with audio that artifacts heavily with 
ffwma2, but plays perfectly with wmadmo.  Uploaded a short sample to
incoming/ named wmabugs.wma.  I also uploaded wmabugs.wmv.

Mencoder with -demuxer lavf is unable to copy WMA audio.  Copying
works fine with the native demuxer.  This demuxer bug seems to have been
introduced somewhere between 1.0pre6 and pre7 (dev-CVS-051221 with
-demuxer 35 copies WMA audio just fine).

But even with recent versions of mencoder, copying the WMA audio into an
AVI file using the native demuxer results in an even more interesting
issue...  ffwma2 is now able to decode that WMA audio (in the AVI file)
without glitches. 

This is really starting to look almost exactly like the (mostly still
unfixed) mp3 glitches/bugs I reported here a while back... 
-RC