pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5063-4271-Miss_Wedderburns_Reel-abc1.ps) >>/Users/jc/w/tmp/Tune-5063-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/4271-Miss_Wedderburns_Reel-abc1.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_50630.log 890 Log file, useful mostly for debugging
Form_50639.log 1105 Log file, useful mostly for debugging
Tune-5063-4271-Miss_Wedderburns_Reel-abc1.abc 1456 ABC music file with the extracted tune(s)
Tune-5063-4271-Miss_Wedderburns_Reel-abc1.ps 46228 PostScript
Tune-5063-4271-Miss_Wedderburns_Reel-abc1.txt 1456 Plain-text file with the extracted tune(s)
Tune-5063-get.log 5488 Log file, useful mostly for debugging
Tune-50634-get.log 9757 Log file, useful mostly for debugging
Tune-50635-get.log 7989 Log file, useful mostly for debugging
Tune-50638-get.log 5880 Log file, useful mostly for debugging
Tune-50639-get.log 6102 Log file, useful mostly for debugging
These files should be available for 24 hours.