When you collect from a production building, you can't select it again unless you select another building first.
How to recreate:
-Click on a production building (A window opens)
-Click collect (The window closes)
-Try to click the same building again. Nothing happens.
-Click another building and then click on the first one again (everything works fine again).
I checked and upgrading a building does not seem to have the same problem.
Edited by Predo, 07 March 2016 - 12:03 PM.