pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4059-FlyingScotsman.ps) >>/Users/jc/w/tmp/Tune-4059-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/FlyingScotsman.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_40595.log 122 Log file, useful mostly for debugging
Form_40591.log 926 Log file, useful mostly for debugging
Form_40597.log 946 Log file, useful mostly for debugging
Tune-4059-FlyingScotsman.abc 1754 ABC music file with the extracted tune(s)
Tune-4059-FlyingScotsman.ps 41957 PostScript
Tune-4059-FlyingScotsman.txt 1754 Plain-text file with the extracted tune(s)
Tune-4059-get.log 5217 Log file, useful mostly for debugging
These files should be available for 24 hours.