I am in a ROP Gold latest patch v. 1.11 in PBEM. As Prussia, twice I have won battles where there was a message I could promote Little Henry (to 3 star) and Dreisler (to 2 star). Knowing the quirks of how promotions work, I removed each from command, separated them out in the region, and clicked the promotion button. For two straight turns. Nothing happened. Then the button was greyed out again. A few turns later same thing happened with the same guys after I won another battle.
I have decided to give up trying to promote anyone, as clearly something is amiss. Either that, or the rules have changed. Anyone else having this problem? It is tough enough having to take leaders out of circulation for a turn to promote them, but when it doesn't happen it is really frustrating.