I don't think it's a 5.0.0.X version problem. It's that the program uses API's that have changed even the ever slightest. Those apps that are TIED into the OS (such as AIM, MSN, all those instant messaging apps, and FB included) have to be updated to work with that OS. It's possible that the 1.6 will work, but FB and RIM will have to work together to include the code to work with both operating systems in one... It's a shame. I want 5.0.0.120 to come out already! I want it :$.