Anybody else getting a regular "cannot establish a secure connection to the site..." warning when trying to post, or is just me?

I think that means the site's Certificate is out of date.

Any ideas Martin? I thought it might a Safari issue, but it's happening in Chrome as well, with annoying regularity. I fully accept it might be a problem my end so any help gratefully received.

Things to Do When Experiencing ERR_SSL_PROTOCOL_ERROR:

Clear SSL State.
Verify SSL Certificate ( https://www.ssltrust.co.uk/ssl-tools/ssl-checker ).
Check the System Time and Date.
Clear Browser Cache and Cookies.
Disable Browser Extensions.
Update Browsers to Latest Version.
Update Your Operating System.
Temporarily disable Antivirus and Firewall (Sometimes these software might incorrectly block a secure connection).