pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7775-24CountryDances_1809_Button_Whitaker.ps) >>/Users/jc/w/tmp/Tune-7775-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/24CountryDances_1809_Button_Whitaker.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_7775.log 284329 Log file, useful mostly for debugging
Coll_77751.log 607999 Log file, useful mostly for debugging
Coll_77753.log 777485 Log file, useful mostly for debugging
Coll_77756.log 458553 Log file, useful mostly for debugging
Tune-7775-24CountryDances_1809_Button_Whitaker.abc 20775 ABC music file with the extracted tune(s)
Tune-7775-24CountryDances_1809_Button_Whitaker.ps 190854 PostScript
Tune-7775-24CountryDances_1809_Button_Whitaker.txt 20775 Plain-text file with the extracted tune(s)
Tune-7775-get.log 19480 Log file, useful mostly for debugging
Tune-77750-get.log 3540 Log file, useful mostly for debugging
Tune-77751-get.log 4401 Log file, useful mostly for debugging
Tune-77752-get.log 3867 Log file, useful mostly for debugging
Tune-77759-get.log 8091 Log file, useful mostly for debugging
These files should be available for 24 hours.