SoM - add computers - nothing happens

SoM - add computers - nothing happens

This has been present for at least a couple of patch versions. In the Scope of Management screen, if I click Add Computers, I see my domains. If i click Select Computers beside my domain nothing happens when usually there's a pop-up with a list of computers available. Due to this I can't remotely add the client to any machines. I've tried it in Firefox 39.0.3 and IE 11. I've cleared cache, nothing, pop-up blockers are off.

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