Reply is using wrong email account

I use the eM Client with two accounts. The primary one is a Hotmail account.
Everything was working fine until today.
Now when I click Reply or New the email sender is the other account.
And in the drop down at the top of the email, there is only that other account.

I am using v 9.2.2258

Now when I click Reply or New the email sender is the other account.

Could be your default account has changed. Click “Menu / Accounts”. Then “click your account you want as the default on the left” and finally click “Set as default” along the top.

And in the drop down at the top of the email, there is only that other account.

Go to “Menu / Accounts” (Pc), or “eM Client / Accounts” (Mac). Then click on the Accounts / General tab and Scroll down to Services and check that “everything is selected” including Airsync.

If they are not all checked, enable them all and then Save and Close accounts and exit and restart eM Client

It was the Airsync turned off causing the issue. Odd.
Thanks for the tip.