Unanswered Political Messages, etc

I'm playing a PBEM, non-simultaneous, 4-player SEV 1.74 game as the last of 4 players and I'm having trouble with empire communications.

Last turn, I received a treaty message and a gift (of a planet) message. I answered both in the affirmative and sent a gift of my own. When I went to end my turn, I got the "We still have - 1 unanswered political message." I went and checked, but everything had been answered.

Next turn, the treaty is active, but I still don't have the gifted planet. The only communications in the log are "Your message was sent" messages. When I try to end my turn, I see "We still have - 2 unanswered political messages."

I'm guessing the game is warning about messages that were sent this round (and thus, I shouldn't see them until next round). Sequential mode would be a lot better if it didn't act like simultaneous mode.