I encounter this Heroku platform pretty frequently and it never works for me. I can't figure out if it's a plugin that I am missing, or if I am using an incompatible browser or what. I did a forum search and can't find a good answer. FWIW I'm running firefox on a Mac. Also: am I really missing anything by not being able to do these? If they're just bad hits I won't keep trying to make them work.