pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6339-Bonnie_Lass_o_Bon_Accord-A,Am-32-3,4.ps) >>/Users/jc/w/tmp/Tune-6339-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/air/Bonnie_Lass_o_Bon_Accord-A,Am-32-3,4.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
Form_63398.log 865 Log file, useful mostly for debugging
Tune-6339-Bonnie_Lass_o_Bon_Accord-A,Am-32-3,4.abc 797 ABC music file with the extracted tune(s)
Tune-6339-Bonnie_Lass_o_Bon_Accord-A,Am-32-3,4.ps 40292 PostScript
Tune-6339-Bonnie_Lass_o_Bon_Accord-A,Am-32-3,4.txt 797 Plain-text file with the extracted tune(s)
Tune-6339-get.log 4950 Log file, useful mostly for debugging
Tune-63390-get.log 4156 Log file, useful mostly for debugging
These files should be available for 24 hours.