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You might look into preventing caching: https://support.tigertech.net/prevent-caching

Hi Dragonexpert,

which of the methods listed in that post do you suggest I tried?

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I am still totally at a loss as to WHAT might have caused it and why...

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UPDATE:

I've added the following to my forum .htaccess:

ExpiresActive On
ExpiresDefault A1
Header append Cache-Control must-revalidate

to make the cache last 1 sec (whatever that means in practical terms), but it has made no difference.

Look at this message for example...
https://www.dropbox.com/s/mvixvxhug8ijpr...9.png?dl=0
it says that it was written 19 mins ago, instead it came through last night.
(however earlier on it said taht had been written 1 min ago...)
Also I am logged on as the sender of that message.

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Further update:

This morning I deactivated a plugin as a test, ("who browsed topic"), but although it is not there, it still appears in the list of active plugins within the ACP.

Also I have a warning for GoogleSEO taht shouldn't be there,

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LAST UPDATE FOR NOW:

I have tried also removing the cache with

Header unset Cache-Control
Header append Cache-Control "no-cache, must-revalidate"

but no change