Hi Matthew, thanks for the quick answer. Do you mean in the asl_gui.txt file? change from #!/usr/bin/env python to #!/usr/bin/env fslpython? Sorry for the basic questions, but as I said I am just starting to work with unix.. ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1