pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86475-Pulling_Bracken_Set-BSFC---.ps) >>/Users/jc/w/tmp/Tune-86475-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/set/Pulling_Bracken_Set-BSFC---.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-86475-Pulling_Bracken_Set-BSFC---.abc 3015 ABC music file with the extracted tune(s)
Tune-86475-Pulling_Bracken_Set-BSFC---.ps 52083 PostScript
Tune-86475-Pulling_Bracken_Set-BSFC---.txt 3015 Plain-text file with the extracted tune(s)
Tune-86475-get.log 11151 Log file, useful mostly for debugging
These files should be available for 24 hours.