Invalid Security Certificate - sorted a reboot of the computer fixed it

[#1]

Firefox 47.0.1 just threw a wobbly when I was posting from an autosaved post (power cut in between) and look what happened

So is this a Lithium problem or is it down to the fact that Kaspersky just updated (after the power cut) to 16.0.1.445c

[#2 · Accepted solution]

something was screwed by Kaspersky - reboot fixed it