pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7879-3101_a_Skye_Air.ps) >>/Users/jc/w/tmp/Tune-7879-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/3101_a_Skye_Air.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_7879.log 1193365 Log file, useful mostly for debugging
Coll_78793.log 249206 Log file, useful mostly for debugging
Tune-7879-3101_a_Skye_Air.abc 1042 ABC music file with the extracted tune(s)
Tune-7879-3101_a_Skye_Air.ps 42335 PostScript
Tune-7879-3101_a_Skye_Air.txt 1042 Plain-text file with the extracted tune(s)
Tune-7879-get.log 4465 Log file, useful mostly for debugging
Tune-78797-get.log 4243 Log file, useful mostly for debugging
These files should be available for 24 hours.