Thank you! I was not able to create a .afnirc file because the computer said a file could not have a name that begins with a dot. If you have the patience to tell a person who is still in the babbling stage of unix where I am going wrong there, that would be great because I would like to change the environment in other ways. BUT, I was able to fix the path with a command I found in the readme files and AFNI seems happier.
Another question - if I do not want a overlay to display at all, can that be done? (I am working with structurals only).
Thank you for your advice and patience.
Juliana