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[Rusty2009]

You've made a different change to what I said to do - I said after the first line, you needed the second line, you have instead replaced the first line with the second line.

So, this time, above:

var cookieSecureFlag = "{$mybb->settings['cookiesecureflag']}";

add

var cookiePrefix = "{$mybb->settings['cookieprefix']}";

Upgrade again to 1.8.10 and this should be fixed.

Many thanks this seems to have resolved the issue.

Although it worked once on my next it was back to square one.

So I added the var cookieSecureFlag = "{$mybb->settings['cookiesecureflag']}"; setting that Matt posted above that seems to have fixed the issue.