pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-275-BonnieCharlie_3_Dm.ps) >>/Users/jc/w/tmp/Tune-275-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SCD/misc/BonnieCharlie_3_Dm.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
Coll_27527.log 136152 Log file, useful mostly for debugging
Coll_27540.log 263379 Log file, useful mostly for debugging
Coll_27558.log 144017 Log file, useful mostly for debugging
Coll_2756.log 1031411 Log file, useful mostly for debugging
Coll_27580.log 132522 Log file, useful mostly for debugging
Coll_27594.log 142202 Log file, useful mostly for debugging
Form_27505.log 867 Log file, useful mostly for debugging
Form_27507.log 823 Log file, useful mostly for debugging
Form_27525.log 815 Log file, useful mostly for debugging
Form_27529.log 821 Log file, useful mostly for debugging
Form_27538.log 815 Log file, useful mostly for debugging
Form_27539.log 949 Log file, useful mostly for debugging
Form_27591.log 871 Log file, useful mostly for debugging
Form_27597.log 820 Log file, useful mostly for debugging
Tune-275-BonnieCharlie_3_Dm.abc 559 ABC music file with the extracted tune(s)
Tune-275-BonnieCharlie_3_Dm.ps 36554 PostScript
Tune-275-BonnieCharlie_3_Dm.txt 559 Plain-text file with the extracted tune(s)
Tune-275-get.log 4397 Log file, useful mostly for debugging
Tune-27513-get.log 2960 Log file, useful mostly for debugging
Tune-27517-get.log 4484 Log file, useful mostly for debugging
Tune-27547-get.log 4132 Log file, useful mostly for debugging
Tune-27570-get.log 3734 Log file, useful mostly for debugging
Tune-27571-get.log 3568 Log file, useful mostly for debugging
Tune-2758-get.log 3170 Log file, useful mostly for debugging
Tune-27586-get.log 3178 Log file, useful mostly for debugging
These files should be available for 24 hours.