I have the same issue. I also updated the Windows 8.1 today when I tried to relog afterwards I couldn't. Online
support told me I was out of luck and to wait for the next update.Looking on the LL website I also saw that all
requirements were for Windows XP, or 7. So I think Windows is the issue. If I find out something I will post it back to you.
I know this doesn't help ....