SR 2 error - editor mode does not work anymore

Hi, 

I'm writing from Leiden, HOlland. Yesterday I updated my Trados Studio 2015 Freelance to SR-2, after not having worked with the program for some time, and today it's giving me all kinds of problems.

The worst is: I can't work at all, because the editor mode no longer works! Please help! 

 

This is what it looks like: 

Best,

Anna