I haven't had any recent problems with the seat selector either.

As far as seating preferences, EAU has always offered my choice (window.) It usually throws me in the back rows of the cabin, so I use seat selector to move closer forward so that I have at least decent odds of getting a meal choice on flights with meals. I prefer window over aisle when traveling in first class and in the last 50 or so EAU's, I've always been offered a window.