pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6000-3153.ps) >>/Users/jc/w/tmp/Tune-6000-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/3153=Johnny_Pringle.abc2.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_60002.log 261852 Log file, useful mostly for debugging
Coll_60003.log 1324031 Log file, useful mostly for debugging
Form_60004.log 874 Log file, useful mostly for debugging
Sess-60004.log 617954 Log file, useful mostly for debugging
Tune-6000-3153.abc 945 ABC music file with the extracted tune(s)
Tune-6000-3153.ps 39759 PostScript
Tune-6000-3153.txt 945 Plain-text file with the extracted tune(s)
Tune-6000-get.log 4695 Log file, useful mostly for debugging
Tune-60001-get.log 3962 Log file, useful mostly for debugging
Tune-60003-get.log 84360 Log file, useful mostly for debugging
Tune-60009-get.log 4887 Log file, useful mostly for debugging
These files should be available for 24 hours.