If I can be of help, I have a similar problem every now and then with the log in. It might not be the same problem, but I usually go to "Tools," then "Internet Options," and then click on "Delete Cookies." It works wonders and fixes the problem. You may have the same problem. Let me know if deleting and refreshing the cookies works. If not, UmbraeNoctem is right on the softwares.
"Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing." Robert E. Howard