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Dave, Congratulations! You're in the top-5 most obscure LDM problems of all time! :-) The problem appears to be that you don't have a 64-bit dynamic loader (ld.so(8)), which is needed to execute the 64-bit GEMPAK programs: [ldm@twister ~]$ locate ld-linux.so /archive/diskimages/usr/share/man/man8/ld-linux.so.8.gz /drobo/backups/aurora/usr/share/man/man8/ld-linux.so.8.gz /drobo/backups/snowball/usr/share/man/man8/ld-linux.so.8.gz /drobo/backups/tarfiles/snowball/usr/share/man/man8/ld-linux.so.8.gz /lib/ld-linux.so.2 /usr/share/man/man8/ld-linux.so.8.gz /usr/share/man/overrides/man8/ld-linux.so.8.gz /usr/share/man/overrides/ru/man8/ld-linux.so.8.gz [ldm@twister ~]$ file /lib/ld-linux.so.2 /lib/ld-linux.so.2: symbolic link to `ld-2.12.so' [ldm@twister ~]$ file /lib/ld-2.12.so /lib/ld-2.12.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped [ldm@twister ~]$ /lib/ld-linux.so.2 --list /home/gempak/GEMPAK7/os/linux64/bin/dcgrib2 /home/gempak/GEMPAK7/os/linux64/bin/dcgrib2: error while loading shared libraries: /home/gempak/GEMPAK7/os/linux64/bin/dcgrib2: wrong ELF class: ELFCLASS64 [ldm@twister ~]$ You'll have to install whatever package is necessary in order to obtain a 64-bit ld.so(8). I've CC'ed our system administrator in case I'm way off-base. Regards, Steve Emmerson Ticket Details =================== Ticket ID: FPM-496740 Department: Support LDM Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.