When issuing a recon-all command, I'm seeing the following message:

set: Variable name must contain alphanumeric characters

recon-all stalls and doesn't move forward (doesn't even create the subject directory).

I'm using Freesurfer 5.3.0 (freesurfer-Linux-centos6_x86_64-stable-pub-v5.3.0) on Ubuntu 12.04.2. In fact, we just upgraded to this version of Ubuntu from an older version of Mandriva and to this latest version of Freesurfer. recon-all did not produce this message before these two upgrades. Any help you can offer would be most appreciated! Thanks in advance.