I'm assuming that you are able to get past the login screen, correct? The freezing occurs after you hit the green 'Play' button?
Yes. I log in hit play button and the screen comes up displays rating and SE logo. then just sits on a black screen.

Does switching between DirectX 9 and 11 mode make any difference?
Nope it does the same in other mode.

There is no 'check files' option but have you tried reinstalling the game? Did this have any affect?
Have not done this yet I was hoping to avoid a massive reinstall, but I guess that is what I will try next.