I find it peculiar that there is no response here from the powers that be, even acknowledging that there is an issue...
Has this been fixed for anyone yet?

Same issue here.
I can complete my turn right up to the defensive fire phase, then it asks for an optional message to opponent and once you hit submit it sends you back to login into MP screen, with the game popping up as the turn is not taken - Command phase.

<t> Very late to the party, but I just wanted to say BIG Thank you for all the tutorials, I've much better understanding of the game now then after doing the default Korean war tutorial. On top of that I've had heaps of fun reading through them all. <br/>
On a side note has 1950s tutorial ever made ...

Nice Backstory ads even more depth to the LP. Looking forward to more.