I have been having the same problems, however only when I am using Chrome web browser. I switch to IE and it seems to work fine. Perhaps its just a timing thing. I have been shown as logged in to 4 different people now.
I also have been having issues with clicking on links in my phone browser. Ill click on a thread link or anywhere on the page and it directs me to amazon.com (gussing something to do with the amazon ad on the page).
Just wanted to let you know, your not alone. Hopefully, whomever gets logged in as me does not screw with me!