pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-15395-010_Scots_Measure.ps) >>/Users/jc/w/tmp/Tune-15395-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/SCAJMR/010_Scots_Measure.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_15395.log 918219 Log file, useful mostly for debugging
Form_15395.log 860 Log file, useful mostly for debugging
Tune-15395-010_Scots_Measure.abc 669 ABC music file with the extracted tune(s)
Tune-15395-010_Scots_Measure.ps 35453 PostScript
Tune-15395-010_Scots_Measure.txt 669 Plain-text file with the extracted tune(s)
Tune-15395-get.log 7647 Log file, useful mostly for debugging
These files should be available for 24 hours.