pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-88578-DownYonder1.ps) >>/Users/jc/w/tmp/Tune-88578-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Square/DownYonder1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_88578.log 263256 Log file, useful mostly for debugging
Tune-88578-DownYonder1.abc 495 ABC music file with the extracted tune(s)
Tune-88578-DownYonder1.ps 36917 PostScript
Tune-88578-DownYonder1.txt 495 Plain-text file with the extracted tune(s)
Tune-88578-get.log 4430 Log file, useful mostly for debugging
These files should be available for 24 hours.