Michael,
I think you might want to rename the gism tarfile on your site - a space is
embedded in the tgz name, and when this file is extracted it gives:
gism_rc4_20060307'_' with a space still present at the end! I spent a good
10 minutes trying to cd into gism_rc4_20060307 with no success - I was
checking permissions, ownership, group, everything before I realized that
the space was still there 
~ Eric.