Vista - Unable to transmit text in Group.

I had this problem start about 2 days ago. I am using Windows RC1 build 7100. Whenever I am in a group I can type and send text but no one else ever sees it. My girlfriends computer is right beside mine she is running the same thing as i am and she has no problems at all.

I can see everyone else talking but anything I send is not seen by the rest of the group. I have tried uninstalling and reinstalling the application and still have the same problem. Logging out does nothing. Reseting the PC does nothing. All ports are open on the router.

Anyone have any clue how to fix this?

Also to clarify i am using WLM 2009.

Still nothing has changed after a few days. I tried logging into WLM on some other computers and still have the same problem. I am unable to talk in the group chat at all. I've tried removing myself from the group and getting reinvited but it also did nothing. Is it possible something is wrong with my windows live id?