If you're using a product like NoScript, click on NoScript Icon -> Recently Blocked -> Always Allow from LastPass.If your are using IE, make sure you don't have delete browser information on restart selected in Internet Options.To allow 3rd party cookies in Firefox for example it's Options > Options > Privacy tab, and for 3rd party cookies click 'exceptions' and set an 'always' exception for.If the 3rd party check fails, you need to ensure that is exempted from 3rd party cookie checks, or stop blocking 3rd party cookies.If it's not or it says it's blank, then you're clearing cookies or blocking cookies or not allowing cookies to survive past restarts.The session ID should be the same which allows you to relogin. Restart your browser and return to this page.If you just restarted your cookies have been cleared which is the cause of your problem!.
LastPass Debug If you're having problems staying logged in between browser restarts: