pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86794-Cape_Breton_Visit_To_Shetland-A-32-5.ps) >>/Users/jc/w/tmp/Tune-86794-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/BSFC/reel/Cape_Breton_Visit_To_Shetland-A-32-5.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
Tune-86794-Cape_Breton_Visit_To_Shetland-A-32-5.abc 718 ABC music file with the extracted tune(s)
Tune-86794-Cape_Breton_Visit_To_Shetland-A-32-5.ps 37976 PostScript
Tune-86794-Cape_Breton_Visit_To_Shetland-A-32-5.txt 718 Plain-text file with the extracted tune(s)
Tune-86794-get.log 5494 Log file, useful mostly for debugging
These files should be available for 24 hours.