PC user on 3.1.
Run EDMC and it brings up the Frontier login webpage.
Enter Email/Username and Password.
Click Login button.
Frontier Approve webpage comes up.
Click Approve.
Get a couple of IE warning and security popups, click Allow.
Get IE popup "There was a problem sending the command to the program.", click OK.
Frontier Approve page is still open.
Click Approve again.
Get Frontier "500 Internal Server Error" page.
EDMC is still running.
Start game, go through above routine again with the same result.
EDMC then runs 'ok' but with "Error: Invalid Credentials" at the bottom of it's window.