are 3dcopy & 3drename not case dependent on purpose? no files actually exist with the new prefix but i get the following error messages:
3drename anat1+orig Anat1
** THD_rename_dataset_files: new header Anat1+orig.HEAD already exists!
3dcopy anat1+orig Anat1
++ 3dcopy: AFNI version=AFNI_2008_07_18_1710 (Nov 19 2009) [32-bit]
** FATAL ERROR: Output dataset ./Anat1+orig.HEAD already exists! - EXIT
** Program compile date = Nov 19 2009