I've been having this trouble for days. I keep switching back to United States but later in my session it goes back to Europe. I've cleared my history and cookies and tried it on numerous computers.
This was also happening to me a couple weeks ago. I must say, they have some GREAT deals for people from the UK! I finally got the website to stay on US.
Once you sign in to your MDE ID, look at the top right of the title bar near the Search box. You should see that "Region ? Language" that is set for your account. Just click on the link and change it to US (English). Once set here it should stick.
I've been having this trouble for days. I keep switching back to United States but later in my session it goes back to Europe. I've cleared my history and cookies and tried it on numerous computers.