pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4092-10271_Johnnies_Grey_Breeks.ps) >>/Users/jc/w/tmp/Tune-4092-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ERM/10271_Johnnies_Grey_Breeks.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_4092.log 926621 Log file, useful mostly for debugging
Coll_40920.log 451411 Log file, useful mostly for debugging
Coll_40928.log 461208 Log file, useful mostly for debugging
Coll_40929.log 448609 Log file, useful mostly for debugging
Form_40922.log 792 Log file, useful mostly for debugging
Form_40923.log 1008 Log file, useful mostly for debugging
Tune-4092-10271_Johnnies_Grey_Breeks.abc 551 ABC music file with the extracted tune(s)
Tune-4092-10271_Johnnies_Grey_Breeks.ps 34976 PostScript
Tune-4092-10271_Johnnies_Grey_Breeks.txt 551 Plain-text file with the extracted tune(s)
Tune-4092-get.log 4742 Log file, useful mostly for debugging
Tune-40923-get.log 1378 Log file, useful mostly for debugging
Tune-40929-get.log 6156 Log file, useful mostly for debugging
These files should be available for 24 hours.