Sorry, there is no -regress_no_errts option. Such an option would not be advisable though, since the errts dataset is used for things like TSNR, blur estimates and global correlation.
The hung process is a little odd. It suggests that @ss_review_html is stuck. You could terminate the process if you want to (even ctrl-c), and try re-running those last 2 lines, just to see. I expect you did that already.
tcsh @ss_review_html |& tee out.review_html
apqc_make_html.py -qc_dir QC_$subj
Is the file system full or something?
df -h .
- rick