Also please check if the _wpforo_profile and WordPress _users tables has the same number of rows. wpForo should generate profiles in _wpforo_profile table based on WordPress _users table.

Hi,

Yes, users and profile tables match.

I think it's a plugin conflict problem then I've installed it on another website that has a very plain and simple theme and it's giving the same problem.  But I use the same plugins on that website. 

Do you think it could perhaps be a server related issue (with my web host?)

Hi,

It's working now, it was the following plugin:

https://wordpress.org/plugins/wp-super-cache/

Thank you for pointing me in a direction, I never thought about checking plugins, I thought I installed and configured the forum incorrectly.

Kind Regards

You don't need to deactivate this plugin, it's good to have activated, just navigate to WP Super Cache settings > Advanced Tab and check/enable "Don’t cache pages for known users" option.

Hi,

Thank you, it's working now, with that plugin.