Issue is bizarre. We have a CAS setup with 3 primaries attached. (To get this out of the way: Yes we have a CAS, yes there are disadvantages).
In the SCCM Console, whenever you select a Device Collection and view the Deployments Tab. The Ribbon/Wunderbar in the console should populate with the Delete/Properties buttons, if you right click on a listed deployment those same options should appear.
Instead we have a continuously scrolling grey bar under the ribbon, and all icons are greyed out. In turning on advanced console logging, we see the follow entries displayed continuously:
[19, PID:7524][06/22/2015 07:16:01] :Tasks not in cache for node 'msscnav://root/Windows/Wunderbar/ConsoleDisplay/AssetManagementNode/AssetManagementNodeOverview/DevicesNode/2e1945a8-627b-42ea-bcf1-d17bad4bf91f/901d377d-6dbe-495f-8a4a-1941462113ae/81e2cb84-f782-4d5a-80b0-ab52452265fc', calculating, ID='911480eb-a11d-40ee-87e6-751c9bf4821e-DefaultOpenTask'.
At this point, the remaining areas of the console remain usable; and everything works normally. All deployment properties are inaccessible.