pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3681-2302_Lady_Dumfriess_Reel.ps) >>/Users/jc/w/tmp/Tune-3681-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/2302_Lady_Dumfriess_Reel.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_36813.log 1304361 Log file, useful mostly for debugging
Coll_36814.log 2503346 Log file, useful mostly for debugging
Form_36812.log 1085 Log file, useful mostly for debugging
Tune-3681-2302_Lady_Dumfriess_Reel.abc 845 ABC music file with the extracted tune(s)
Tune-3681-2302_Lady_Dumfriess_Reel.ps 37623 PostScript
Tune-3681-2302_Lady_Dumfriess_Reel.txt 845 Plain-text file with the extracted tune(s)
Tune-3681-get.log 4720 Log file, useful mostly for debugging
Tune-36812-get.log 4561 Log file, useful mostly for debugging
Tune-36813-get.log 5676 Log file, useful mostly for debugging
Tune-36816-get.log 3160 Log file, useful mostly for debugging
Tune-36818-get.log 4707 Log file, useful mostly for debugging
These files should be available for 24 hours.