Edin, I misunderstood and thought all the threads were reading the same file. I agree with you that multiple threads reading different files shouldn't interfere with each other, and if they do that sounds like a bug in netCDF-4. I'll Cc: Ed and see if he knows about what might cause the problem ... --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: WTN-189414 Department: Support netCDF Priority: Normal Status: Closed