pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8674-tb18.ps) >>/Users/jc/w/tmp/Tune-8674-get.log 2>&1" returned status 256
http://nigelgatherer.com/tunes/abc/tb18.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_86742.log 139177 Log file, useful mostly for debugging
Form_86747.log 879 Log file, useful mostly for debugging
Form_86749.log 846 Log file, useful mostly for debugging
Tune-8674-get.log 4219 Log file, useful mostly for debugging
Tune-8674-tb18.abc 360 ABC music file with the extracted tune(s)
Tune-8674-tb18.ps 37665 PostScript
Tune-8674-tb18.txt 360 Plain-text file with the extracted tune(s)
Tune-86742-get.log 2810 Log file, useful mostly for debugging
Tune-86743-get.log 8136 Log file, useful mostly for debugging
Tune-86744-get.log 0 Log file, useful mostly for debugging
Tune-86749-get.log 3770 Log file, useful mostly for debugging
These files should be available for 24 hours.