So there is currently a bug where sometimes when a unit is killed, the exclamation point that says "click this to watch the replay" will never go away. Normally this is a minor inconvience.
However, it gets worse when this occurs on the stardock itself. Now I can no longer click on the stardock to build (see right in the middle of the screenshot below). Thankfully I can do it through the stardock and starbases screen on the upper right, but its a terrible inconvenience.