The whole Internet runs on cookies.
Cookie settings are contained in your browser, which means they are out of my control.
If you are having login issues, by far the number 1 suspect is corrupt or expired cookies in your browser.
As such, protocol is:
1] CLEAN COOKIES
2] CLOSE BROWSER
3] REOPEN BROWSER
4] LOGIN (hitting Remember Me, which sets a NEW cookie!).
If this doesn't work, the next step is to run CCleaner (
www.piriform.com) or something similar. When you download CCleaner, select the free version, and make sure to uncheck all the boxes asking if you want McAfee or Toolbar X or any other BS bloatware. Just get the simple free version of CCleaner, with NOTHING else attached, and run it. THAT will definitely clean your cookies and also should make your browsing zippier and safer.
COOKIES! Clean 'em out, start over by logging in again.