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Hi Dave, I just tried the ncdump in the current netCDF-4 snapshot on your file, and it looks OK: netcdf test_group_def { dimensions: Time = UNLIMITED ; // (1 currently) variables: double Time(Time) ; Time:units = "days since 1900-01-01" ; Time:long_name = "Time" ; data: Time = 3.1415926536 ; group: model2 { dimensions: X = 180 ; Y = 90 ; variables: double X(X) ; X:units = "degreesE" ; X:long_name = "X" ; double Y(Y) ; Y:units = "degreesE" ; Y:long_name = "Y" ; data: ... So the problem you are seeing has been fixed since the netCDF-4.0/3.6.3 release, as I just verified by running your file through ncdump made from that release. I don't remember a problem that would have this symptom, but I could try some intermediate versions on your file to see when the problem was fixed and figure out what the fix was from that. Anyway, let me know if you still see the bug in the current snapshot. We will have an official 4.0.1 release in October with all these accumulated fixes ... --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: REF-194673 Department: Support netCDF Priority: Normal Status: Closed