Homegroup - Can see libraries but cannot open them.

Hi all, I recently upgraded the downstairs computer to windows 7 so we can now use Homegroup library sharing to supposedly make networking windows 7 boxes easier, anyway I set up the homegroup and shared the libraries I wanted shared on both computers, both machine can see the other ones shared libraries but cannot open them, if you click the icon for a library absolutely nothing happens. Networking itself still works fine as you can browse through the other computers shares in the traditional way but Homegroups won't let you open anything.

Any ideas?