I'm using the latest firefox, 3.6.8. I cannot bring up the JS console, even when "show on error/message" is checked when there's a "undefined" script error. No amount of console.print* will force the console to display... yet my scripts are clearly running. I've had to resort to app.alert. Ugh.
Saving the file locally and opening it in Acrobat (or reader with "show console" checked) works fine.