That site is going out of use and its certificate is now out of date.

My BitDefender ant-virus reports that every 15 minutes Opera is accessing that site 4 times in quick succession (BitDefender is blocking because of the old cert but prompts me every time)

I have cleared history (all options that I could see in Advanced) back to "All time" and cannot stop this happening

Doing a text search in the profile (?) folder I found 4 files have the relevant text string (mail.abc.com)...

... AppData\Roaming\Opera Software\Opera Stable\Local Storage\leveldb\000005.ldb (1 hit)

... AppData\Roaming\Opera Software\Opera Stable\Preferences (1 hit)

... AppData\Roaming\Opera Software\Opera Stable\Preferences.backup (1 hit)

... AppData\Roaming\Opera Software\Opera Stable\Top Sites (4 hits)

I suspect that Preferences is not relevant because the string is in the section "removed"

As a first guess I was thinking that the 4 entries in "Top Sites" might be responsible but I can't see how to clear out Top Sites history (I can't see the url listed anywhere when I edit that main page)

Any suggestions ? I'd prefer not to have to create a new profile from scratch but if that's needed please point me at docs for how

TIA
Steve