pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5504-SlaughterHouse.ps) >>/Users/jc/w/tmp/Tune-5504-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/SlaughterHouse.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_55041.log 452809 Log file, useful mostly for debugging
Coll_55044.log 464008 Log file, useful mostly for debugging
Form_5504.log 944 Log file, useful mostly for debugging
Tune-5504-SlaughterHouse.abc 393 ABC music file with the extracted tune(s)
Tune-5504-SlaughterHouse.ps 34961 PostScript
Tune-5504-SlaughterHouse.txt 393 Plain-text file with the extracted tune(s)
Tune-5504-get.log 4473 Log file, useful mostly for debugging
Tune-55040-get.log 1622 Log file, useful mostly for debugging
Tune-55043-get.log 4007 Log file, useful mostly for debugging
Tune-55049-get.log 5631 Log file, useful mostly for debugging
These files should be available for 24 hours.