Can anyone explain https://plex.tv/ logon error

Every time I go to https://plex.tv/ I get both the windows logon dialogue, which won’t accept any of my credentials, along with PLEX saying I’m logged on. Sometimes I can get it to clear, and sometimes I have to close my browser (IE11). I only get it with the PLEX site. Sometimes I can avoid the problem if I select the launch button fast enough. Driving me crazy.

Edit update: This appears to be only an IE11 integration error. I’ve tried Chrome, Firefox, and Opera and cannot duplicate the error.

PLEX Team why is IE a problem? (Save the IE bashing, I have to use it at work so its the one I’m most familiar- Opera Rocks)