I am seeing similar.
Discovery found my devices just fine. The node details page is populated with the basic SNMP details yet no interfaces have been discovered.
If I go to the Interface Monitor tool, select and add two devices from the Available Nodes, then select them in the Selected Interfaces pane, check the check boxes and click on Discover All Interfaces, nothing happens except that the space between the 2 nodes increases as if it is making room for additional info. No interfaces are discovered or added. I have left it for 30+ minutes and nothing changes.
The other tools appear to work as they should with these same devices so SNMP is definatly functional.
One other thing; this is installed on a stand alone laptop not connected to my main system in any way.
-Rob-