pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4854-LightAndAiry1.ps) >>/Users/jc/w/tmp/Tune-4854-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/LightAndAiry1.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_48540.log 263379 Log file, useful mostly for debugging
Coll_48547.log 131917 Log file, useful mostly for debugging
Form_48542.log 822 Log file, useful mostly for debugging
Tune-4854-LightAndAiry1.abc 463 ABC music file with the extracted tune(s)
Tune-4854-LightAndAiry1.ps 34650 PostScript
Tune-4854-LightAndAiry1.txt 463 Plain-text file with the extracted tune(s)
Tune-4854-get.log 4335 Log file, useful mostly for debugging
Tune-48544-get.log 0 Log file, useful mostly for debugging
Tune-48548-get.log 4090 Log file, useful mostly for debugging
These files should be available for 24 hours.