Still having the same problem, so I am now losing daily login bonuses and what not. Is this game pretty dead? I never find anyone in chat and the forums are not very lively. Still no response to this thread.
I am beginning to regret paying for a couple months premium, especially when I cannot consistently log in and there appears to be no player base.
I cleared my FireFox History/cache, restarted it and was able to get in both my Country and Enterprise. Don't know if time solved the issue or my particular actions solved it. What I can tell you is at that time IE was unaffected, only FireFox had the issue. I like to be in my Enterprise on Firefox and my Country on IE. One for each monitor :P