pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-31031-Curlew-D-64-5.ps) >>/Users/jc/w/tmp/Tune-31031-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/jig/Curlew-D-64-5.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-31031-Curlew-D-64-5.abc 865 ABC music file with the extracted tune(s)
Tune-31031-Curlew-D-64-5.ps 41433 PostScript
Tune-31031-Curlew-D-64-5.txt 865 Plain-text file with the extracted tune(s)
Tune-31031-get.log 4509 Log file, useful mostly for debugging
These files should be available for 24 hours.