Hi John!

With this amount of information first thing coming in to my mind is did you check what folder were used for export file?
Safe selection is always /tmp folder (that means file system root's tmp folder, not the /home/username/tmp folder) because access is allowed for all users.

And good side is that Most Linuxes do clean /tmp folder at startup so you do not worry about old unused files there.

If the folder selection was ok then a more information is needed. Start cqrlog from command console like:
cqrlog --debug=1 > /tmp/debug.txt

Just open your log and try to export. When it fails close Cqrlog and examine the /tmp/debug.txt with text editor to find a glue.