Here is the changelog for the patch version 1.7.9 for this game.

Added to previous 1.7.7 and 1.7.8 versions

Fixes
Fixed an issue in Play-by-Email matches where the game could show “This is not your turn to play” incorrectly and block
you from loading your save.
Fixed a bug that allowed a leader without real battle leadership to start a battle.
Fixed a bug that allowed units to attack without a leader present, even when one was required.
Fixed a rare freeze that could occur when the game checked for a leader during movement or combat.
Fixed diplomacy restrictions on movement occasionally lingering after the event that caused them had ended.

Improvements
Improved Steam connection reliability, with more retry attempts and clearer messages if the game can’t connect.
Fixed an issue that could cause the game to fail recognizing your Steam ownership.