GViz: Ucsctrack Issue

I seem to be having an issue with Ucsctrack in GViz:

exfail=UcscTrack(track="CpG Islands", chromosome="chr6", genome="hg19",
start="chromStart", end="chromEnd", name="CpG Islands", from=31731740,
to=31736112)

Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function ".buildRange", for
signature "NULL", "logical", "logical", "NULL"

This occurs when I try to get an area where there are no annotations(i.e.
expected behavior is an empty object).  Is this a known bug?  I'm using the
release version.

Traceback and sessionInfo included below:

Thanks,

Winston Timp

--

-- 
Winston Timp
(410)-417-8467
Postdoctoral Fellow
Johns Hopkins Medicine

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