Oh good lord, all I wanted to do was trace the output of my flash debug player, yet there was nothing in the usual location. Typically I just run
tail -f ~/Library/Preferences/Macromedia/Flash\ Player/Logs/flashlog.txt
in the Terminal and it spits out everything Flash does. The file didn’t exist on my system, so I couldn’t tail it. The solution turned out to be a missing mm.cfg file.
in ~/Library/Application\ Support/, produce a mm.cfg file with the following content:
This, along with a correct debugger, should produce traces.