I am using a line like this
align_epi_anat.py -anat anat+orig -epi epi+orig -epi_base 5 -volreg on -epi_strip None -anat_has_skull no
-tshift_opts -tpattern alt+z -tzero 0 -quintic -save_tsh -save_vr
when I do dry_run I see the command for time shift correction and if I run that line myself things are corrected but when I run the align_epi in the echo it says:
#++ Can not do time shifting of slices. Data is already time shifted