pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28068-CSR-abc2.ps) >>/Users/jc/w/tmp/Tune-28068-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Gow/CSR/CSR-abc2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_28068.log 260446 Log file, useful mostly for debugging
Tune-28068-CSR-abc2.abc 367143 ABC music file with the extracted tune(s)
Tune-28068-CSR-abc2.ps 3713223 PostScript
Tune-28068-CSR-abc2.txt 367143 Plain-text file with the extracted tune(s)
Tune-28068-get.log 239583 Log file, useful mostly for debugging
These files should be available for 24 hours.