Last Sunday I was looking at Explorer bar/History and found that it had only recorded visits on certain days. The details were there up to Thursday but for Fri/Sat/Sun there was nothing. I tried visiting a new site and nothing appeared in the panel.
It was only after midnight (ie from 00:01 Monday) that the History started to work again.
This is a complete mystery to me as I had not made any changes to my History settings or deleted anything during this period (and nobody else would have) - it just randomly stopped and then started working again.
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