I face a problem. I have IE 11 on Windows 7 64-bit, and I can sign in the home page. After clicking Sign in menu, nothing happens.
I open this forum with Google Chrome, and can sign in normally.
Which "home page" do you mean? I don't normally use IE, but I just tried with IE 11 (also on Windows 7 64-bit) and was able to log in just fine when clicking "Sign In" at the top of the forums. I was also able to log in from the WowAce.com homepage (not the forums).
However, something seems to have changed in IE 11 that's causing me to get prompted on every single WowAce page (wowace.com and forums.wowace.com) to "allow software such as Active-X controls and plug-ins to run". That's pretty annoying. It may very well be a browser setting, but I did not change any settings since IE 11 downloaded itself earlier today, and never saw these prompts in IE 10 on the rare occasion I needed to use it (eg. to access the new store).