pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7455-Mock_Hoby-horse.ps) >>/Users/jc/w/tmp/Tune-7455-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JohnWalsh/Mock_Hoby-horse.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_74553.log 454210 Log file, useful mostly for debugging
Form_74550.log 1028 Log file, useful mostly for debugging
Tune-7455-Mock_Hoby-horse.abc 1208 ABC music file with the extracted tune(s)
Tune-7455-Mock_Hoby-horse.ps 33930 PostScript
Tune-7455-Mock_Hoby-horse.txt 1208 Plain-text file with the extracted tune(s)
Tune-7455-get.log 8646 Log file, useful mostly for debugging
Tune-74550-get.log 7350 Log file, useful mostly for debugging
Tune-74557-24CountryDances_1766.abc 158 ABC music file with the extracted tune(s)
Tune-74557-24CountryDances_1766.pdf 2217 Portable Data Format
Tune-74557-24CountryDances_1766.ps 6 PostScript
Tune-74557-24CountryDances_1766.txt 158 Plain-text file with the extracted tune(s)
Tune-74557-get.log 9174 Log file, useful mostly for debugging
Tune-74558-get.log 8633 Log file, useful mostly for debugging
These files should be available for 24 hours.