I got this in the 1.7 beta, but again, saved and reloaded and it went away
I tried the saved but when I reload it, the end turn button didn't show up at all.
I never got this problem I only got this problem recently after I just download and instell 1.7 bata.
If the turn button disappears between turns and you have ships with either autopilot or rally point commands, the game will occasionally hang up on one of those ships.
A quick fix is to select a ship and re-issue the movement command. Sometimes, you might need to move as many as three ships before the game takes off again, but it's quicker than saving and reloading.
Sometimes, a ship is selected and the game freezes on it, even though it has no movement points left. You can cancel the movement command by right clicking on the ship. That works sometimes too.
I didn't have any of my ship on autopilot, it happen at the first few turns at the beginning of the game like the first 2 turns.