[idvusers] Problem using NARR-A as aggregated GRIB files in IDV

I'd like to be able to use a set of NARR-A grb files as a data source to
IDV and be able to display them as an animation and/or use the data
probe/time series tool.   I'm able to do this with NAM grb files by
selecting "aggregated GRIB files" as the data source type.   This fails
with the NARR-A grb files, however.   Only a single time gets shown in the
field selector/times window - and that time seems to be randomly selected
from the set of files.

I'm using IDV 2.3, build data 2007-08-15.  Any advice?

Thanks,
Tim Axelrod