pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-24174-MayYarkersStr1.ps) >>/Users/jc/w/tmp/Tune-24174-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/MayYarkersStr1.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Form_24174.log 1179 Log file, useful mostly for debugging
Tune-24174-MayYarkersStr1.abc 2185 ABC music file with the extracted tune(s)
Tune-24174-MayYarkersStr1.ps 58578 PostScript
Tune-24174-MayYarkersStr1.txt 2185 Plain-text file with the extracted tune(s)
Tune-24174-get.log 5228 Log file, useful mostly for debugging
These files should be available for 24 hours.