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Unable to restore last session after installing latest version of Firefox

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Unable to restore last session after installing latest security update (20150630154324) for Firefox 39.0. This happened when version/security update as well and is unbelievably frustrating. Under 'Bookmarks' menu, the 'Restore previous session' option is greyed out. I have selected "Show my windows and tabs from last time" from the 'Options General' menu but it still does nothing.

Unable to restore last session after installing latest security update (20150630154324) for Firefox 39.0. This happened when version/security update as well and is unbelievably frustrating. Under 'Bookmarks' menu, the 'Restore previous session' option is greyed out. I have selected "Show my windows and tabs from last time" from the 'Options General' menu but it still does nothing.

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I have sorted this out but I cannot use Mozilla if this continues. I lost hours and hours of research work. Basically gone.