Same here, although my last 3 games have run fine. Sadly in response to my ticket support said "Unfortunately if you're using mods, we're unable to support them." Which is fine, I get mods can mess stuff up

Andros could you check the debug.err file and see if the last entry has anything to do with combat? Similar to this:-

Debug Message:  CBattleSystem::AddBattle IncrementMovementHoldCount ticket 10 attackerID 22899 defenderID 24096 count 22

Debug Message: Fleet Created. [PlayerID 24] [FleetID 2146273]
Debug Message: EjectShipsFromStation
Debug Message: PlaceShipOnMap. tileX 212 tileY 105
Debug Message: Fleet Created. [PlayerID 24] [FleetID 2146274]

this was the last lines of the debug.err what i find funny now is that it has actions recorded for player 24 yet the game freezes on player 13 so i went back to see what player 13 did and found this

 

Debug Message: IGC3Player::RequestEndTurn playerID 12
Debug Message: IGC3Player::GetAndClearClickedRequestEndTurn 12
Debug Message: CPlayerSystem::IterateCurrentPlayer to 7
Debug Message: IAIOpponent::UpdateAIMovePhaseJob PlayerID 14

while i could be wrong it looks like it says

player 12 end turn 
confirm player 12 end turn
change current player to player 7
start turn player 14

in other words player 13 doesnt even get a turn