pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8324-Mathematician.ps) >>/Users/jc/w/tmp/Tune-8324-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/hornpipe/Mathematician.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_8324.log 382680 Log file, useful mostly for debugging
Coll_83241.log 505434 Log file, useful mostly for debugging
Coll_83242.log 548470 Log file, useful mostly for debugging
Coll_83245.log 306810 Log file, useful mostly for debugging
Sess-83249.log 101012742 Log file, useful mostly for debugging
Tune-8324-Mathematician.abc 699 ABC music file with the extracted tune(s)
Tune-8324-Mathematician.ps 39316 PostScript
Tune-8324-Mathematician.txt 699 Plain-text file with the extracted tune(s)
Tune-8324-get.log 4488 Log file, useful mostly for debugging
Tune-83240-get.log 1431 Log file, useful mostly for debugging
Tune-83244-get.log 1364 Log file, useful mostly for debugging
These files should be available for 24 hours.