I've got several windows 7 machines now, and an xbox 360. I've noticed that sometimes the "play to" option is available, and sometimes it's not. If I open up media player on one machine, and I've got the streaming options set with the proper permissions for that machine to allow from the other, it seems to show up and work (but only sometimes)
The 360 shows up in the permissions list, but I'm unable to stream to it (play to). Do I need to have the 360 running in media center extender mode?
Does windows media player have to be open already on the machine that I'm trying to "play to"? Can it work with a guest account (client or server)? Does the account need to be logged in, on the client?
Any other reasons a machine might not show up in the play to list (like if you're already playing something maybe?)