Thank you for the reminder. I put in a fix for this and it should be in the current snapshot ftp://ftp.unidata.ucar.edu/pub/netcdf/snapshot/netcdf-4-daily.tar.gz But I must ask out of curiosity: how do you get to the point of passing in a null path to the netcdf library? =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: WLE-423514 Department: Support netCDF Priority: Normal Status: Closed