Sebastian,
I agree with you that this is how it should work. However, here is the scenario:
1. When I create a new page, and click the permissions tab I see the grid, but I cannot click on any of the groups to add permissions.
2. I did find a work around by going to the 'Page Management' portion in the portal, and I could edit permissions there.
So, it appears to only be an issue when attempting to modify permissions on within the Page permissions page, or within the page itself, but within the admin tool panel from Page Management it works fine.
Ideas? Also, I am aware that 7.0 is out of beta, but given 7.1.2 was just recently released and the fact that I still had the posted bug report open, I thought this was the appropriate forum. I will post elsewhere going forward.
Thanks!
Dustin