Cloriform

Was having the same problem reading the thread gave me an idea, go to internet options, privacy, and turn it down a few notches, worked for me and was able to log in. Hope this helps for you or anyone else in the future

You must be logged into nexus and nexus mod manager. I had that problem to and just had it again but I remembered so I thought Id pass it along just in case you have not figured it out.