I've had this problem for ages, but have never got around to trying to resolve it.
I log in "forever" in the top left corner with Username and Password.
The Password never works, and I am taken to a pop up window in the middle of the screen, where I retype the password and I can then gain entry to the site.
Sometimes when I turn the PC on, I'm already logged in, and other times I need to go through the above procedure.
I'm using Windows 7 Home Premium and Internet Explorer as my browser.
Any ideas???