I had two Fountainports, enough untapped lands and map tokens to activate both Fountainports with their two mana effect. However, after sacrificing one token die the 2-mana Fountainport effect and drawing a card, the game would not let me activate the second Fountainport. The game acted as if the second Fountainport was tapped (it wasn't). However, after going into combat, the second Fountainport behaved normal again.