Gold statues count toward creature population
Steps to reproduce:
Claim a gateway, build some rooms
Create a large quantity of golden statues, insure that they aren't mined
Blood money your entire army
At this point, the gateway should pretty much stop spawning troops.
Eliminate Statues
Now, the gateways should start spawning again.
Game Version:
Steam Public
Platform:
Windows
(The fix is pushed and will be in next hotfix)