I clicked on an old tab that was previously showing the alliance advisor page. I clicked nothing on the page except for "Portal", at which point it asked me to answer a capcha. When the capcha was answered, it logged me into alliance and put me right back on the Alliance Advisor page, now logged in, and wasted 11 hours of bonus (I was one hour from 12 hour login bonus). Definitely seems like a bug. Clicking on portal should not relog you into an old tab. =/