pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1608-PottenEndReel1.ps) >>/Users/jc/w/tmp/Tune-1608-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/PottenEndReel1.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_16081.log 266199 Log file, useful mostly for debugging
Coll_16085.log 256329 Log file, useful mostly for debugging
Find_16085.log 1509 Log file, useful mostly for debugging
Form_16083.log 720 Log file, useful mostly for debugging
Tune-1608-PottenEndReel1.abc 520 ABC music file with the extracted tune(s)
Tune-1608-PottenEndReel1.ps 35790 PostScript
Tune-1608-PottenEndReel1.txt 520 Plain-text file with the extracted tune(s)
Tune-1608-get.log 6719 Log file, useful mostly for debugging
Tune-16082-get.log 19057 Log file, useful mostly for debugging
Tune-16083-get.log 4862 Log file, useful mostly for debugging
Tune-16086-get.log 2924 Log file, useful mostly for debugging
Tune-16089-get.log 4376 Log file, useful mostly for debugging
These files should be available for 24 hours.