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[idvusers] Cross-section of derived fields + multiple times = NullPointerException

I've run into this problem where if I try to draw cross-sections on a derived field (e.g., potential temperature) and try to load more than one forecast time, the display will not appear and I get the following errors: 

ERROR: Creating display: Color-Shaded Cross Section
java.lang.NullPointerException
java.lang.NullPointerException
at ucar.unidata.data.grid.GridUtil.setSpatialDomain(GridUtil.java:353) at ucar.unidata.data.grid.GridUtil.setSpatialDomain(GridUtil.java:333) at ucar.unidata.idv.control.CrossSectionControl.make2DData(CrossSectionControl.java:1736) at ucar.unidata.idv.control.CrossSectionControl.loadData(CrossSectionControl.java:1582) at ucar.unidata.idv.control.CrossSectionControl.loadDataFromLine(CrossSectionControl.java:1566) at ucar.unidata.idv.control.CrossSectionControl.applySmoothing(CrossSectionControl.java:1613) at ucar.unidata.idv.control.DisplayControlImpl.applyAttributesToDisplayables(DisplayControlImpl.java:1517) at ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1066) at ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:987) at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:912) 
        at ucar.unidata.util.Misc$3.run(Misc.java:1089)
The problem also occurs with another derived field (Relative humidity), and with different NWP models, so I suspect this may be a general problem with "derived" quantitites. I've run this on both OSX and Linux 64-bit systems . . . 

Thanks,

Kevin
______________________________________________________________________
Kevin Tyle, Systems Administrator               **********************
Dept. of Atmospheric & Environmental Sciences   ktyle@xxxxxxxxxxxxxxxx
University at Albany, ES-235                    518-442-4578 (voice)
1400 Washington Avenue                          518-442-5825 (fax)
Albany, NY 12222                                **********************
______________________________________________________________________
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