That's a bizarre bug -- the clef has the correct (all zeros) matrix, but somehow the following note (the f2, which does exist correctly in the cmn data) is the thing that is made invisible -- I'll have to poke around at this. On the version number: I've been using a date as the version for clm/cmn/snd all along -- version numbers like 18.55.12345 have always struck me as silly.