Are you saying you don't see anything in the frame on the right but the subnet structure is shown on the left frame? If so, it sounds like you don't have any individual addresses added to the subnet. If you click through the manage subnets, do you see any IP addresses in the frame on the right?
When you click on a subnet (either through search or from a resource which lists subnets on the summary page), it should take you to that specific subnet in the Manage Subnets page. It sounds like that is working as expected, you just don't see any individual addresses.
Let me know what you find.