pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9383-AGMr01.ps) >>/Users/jc/w/tmp/Tune-9383-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/AG/AGMr01.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_93832.log 261969 Log file, useful mostly for debugging
Form_9383.log 828 Log file, useful mostly for debugging
Form_93838.log 0 Log file, useful mostly for debugging
Tune-9383-AGMr01.abc 498 ABC music file with the extracted tune(s)
Tune-9383-AGMr01.ps 36463 PostScript
Tune-9383-AGMr01.txt 498 Plain-text file with the extracted tune(s)
Tune-9383-get.log 4332 Log file, useful mostly for debugging
Tune-93833-get.log 3216 Log file, useful mostly for debugging
Tune-93834-get.log 3701 Log file, useful mostly for debugging
Tune-93835-get.log 2445 Log file, useful mostly for debugging
Tune-93838-get.log 3901 Log file, useful mostly for debugging
These files should be available for 24 hours.