Since upgrading to 42.0b6 and 42.0b7 I cannot log into one particular wordpress admin account or into an account on a government site. The government site seems to follow through but upon answering a security question the site responds with a message: You have either attempted to access this Web site directly, or have used a bookmark. No bookmark was used to access the site in either case. Notes: Can log into other wordpress admin sites using the current browser Can log into the above noted sites using same computer but different browser Can log into the above noted sites using a different computer Mac OS X 10.8.5 (Mountain Lion) with Firefox 41.0.2 My troubleshooting attempts: Cleared cache repeatedly and with every cookie and history deletion and restart Deleted all cookies Deleted all cookies.sqlite files Deleted sites history and set to forget site Disabled all plugins/addons and tested Run in safe mode and tested Run in safe mode and turned off "Use Hardware Acceleration" Reset and ensured accept cookies are turned on, including from 3rd parties and set to always Oddities: The ability to log into other wordpress sites using the current browser (all are shared hosting sites, but different hosts) Upon successful login to government account site from the different computer with Firefox 41.0.2, I am advised that I logged in earlier from the original computer that states the above noted message. Thanks in advance and great appreciation to anyone assisting to solve this mystery.