pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5478-1182_Roary_Macnab.ps) >>/Users/jc/w/tmp/Tune-5478-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/1182_Roary_Macnab.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_54780.log 1398496 Log file, useful mostly for debugging
Coll_54785.log 1514282 Log file, useful mostly for debugging
Coll_54786.log 256231 Log file, useful mostly for debugging
Form_54786.log 866 Log file, useful mostly for debugging
Tune-5478-1182_Roary_Macnab.abc 809 ABC music file with the extracted tune(s)
Tune-5478-1182_Roary_Macnab.ps 38173 PostScript
Tune-5478-1182_Roary_Macnab.txt 809 Plain-text file with the extracted tune(s)
Tune-5478-get.log 4554 Log file, useful mostly for debugging
Tune-54787-get.log 6019 Log file, useful mostly for debugging
These files should be available for 24 hours.