pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3470-FriendlyVisit.ps) >>/Users/jc/w/tmp/Tune-3470-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/src/jcabc2ps-20150117/abc/FriendlyVisit.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
Coll_34705.log 250689 Log file, useful mostly for debugging
Sess-34703.log 112433 Log file, useful mostly for debugging
Tune-3470-FriendlyVisit.abc 493 ABC music file with the extracted tune(s)
Tune-3470-FriendlyVisit.ps 36417 PostScript
Tune-3470-FriendlyVisit.txt 493 Plain-text file with the extracted tune(s)
Tune-3470-get.log 4591 Log file, useful mostly for debugging
Tune-34704-get.log 5017 Log file, useful mostly for debugging
These files should be available for 24 hours.