Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Button_Whitaker.abc/1810"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7531-1810.ps) >>/Users/jc/w/tmp/Tune-7531-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/Button_Whitaker.abc/1810

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_75312.log 253420 Log file, useful mostly for debugging
Coll_75316.log 246396 Log file, useful mostly for debugging
Coll_75317.log 1741765 Log file, useful mostly for debugging
Coll_75319.log 875741 Log file, useful mostly for debugging
Find_75315.log 1583 Log file, useful mostly for debugging
Form_7531.log 1120 Log file, useful mostly for debugging
Form_75311.log 878 Log file, useful mostly for debugging
Form_75316.log 874 Log file, useful mostly for debugging
Form_75319.log 832 Log file, useful mostly for debugging
Tune-7531-1810.abc 157 ABC music file with the extracted tune(s)
Tune-7531-1810.ps 6 PostScript
Tune-7531-1810.txt 157 Plain-text file with the extracted tune(s)
Tune-7531-get.log 3988 Log file, useful mostly for debugging
Tune-75310-get.log 4298 Log file, useful mostly for debugging
Tune-75314-get.log 177216 Log file, useful mostly for debugging
Tune-75318-get.log 1413 Log file, useful mostly for debugging
These files should be available for 24 hours.