pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-45527-WaltzCountryDance.ps) >>/Users/jc/w/tmp/Tune-45527-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/program/event/20151231/WaltzCountryDance.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_45527.log 137438 Log file, useful mostly for debugging
Tune-45527-WaltzCountryDance.abc 648 ABC music file with the extracted tune(s)
Tune-45527-WaltzCountryDance.ps 34287 PostScript
Tune-45527-WaltzCountryDance.txt 648 Plain-text file with the extracted tune(s)
Tune-45527-get.log 5979 Log file, useful mostly for debugging
These files should be available for 24 hours.