Further Alsa audio troubles: F7 with latest updates

Once I got the weird permissions problems sorted out (thanks, Google), I
now have this problem, which seems to be coming
from in the bowels of the alsa stuff:

audio_alsa_sink[plughw:0,0]: set_period_time_near failed: Invalid

I grabbed the latest dev Gnu Radio code via SVN, just in case, but this
problem persists.