pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6645-2102_Isle_of_Sky.ps) >>/Users/jc/w/tmp/Tune-6645-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/2102_Isle_of_Sky.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_66453.log 474009 Log file, useful mostly for debugging
Coll_66458.log 249206 Log file, useful mostly for debugging
Coll_66459.log 1266425 Log file, useful mostly for debugging
Tune-6645-2102_Isle_of_Sky.abc 1090 ABC music file with the extracted tune(s)
Tune-6645-2102_Isle_of_Sky.ps 41244 PostScript
Tune-6645-2102_Isle_of_Sky.txt 1090 Plain-text file with the extracted tune(s)
Tune-6645-get.log 4556 Log file, useful mostly for debugging
Tune-66455-get.log 52840 Log file, useful mostly for debugging
These files should be available for 24 hours.