You can start by REMOVING ANY CACHING FROM wpForo: <!-- plugin=object-cache-pro client=phpredis metric#hits=19966 metric#misses=794 metric...

@stefenhawkings Just DISABLE and DELETE the W3TC plugin. Nothing else is needed for you to do.

W3TC is an open invitation for trouble. Not to wpForo only but for any Wordpress site. Still, if you want to use it, EXCLUDE wpForo page(s). Exclude...

@sergido I don't think wpForo rewrites a slug (url). I have never seen that, anywhere. Still, someone could check this from the support here and hel...

I don't see anything in my tone as you say, i just post what i have seen here from you. Still, i apologize if you think that. As the OT suggested, i...

@percysgrowroom You have been given some possible solutions but you are unwilling to try. Instead you use (for example) Litespeed cache, a plugin th...

This is strange. Have you tried the default theme, or a different theme?

Ok, is this a WPML site? Can you disable some plugins one by one and check?

What PHP version are you using?

Not related (?) to the issue but you must remove totally or exclude Hummingbird from wpForo.

This can ONLY been done by editing the DATABASE directly. I wouldn't suggest it, still ...

@ffooccuuss How to they try to moderate the post? What is the exact link the are trying to access when they get the warning? Could be that this warn...

What a waste of time.

@wetfish Sorry, i'm out of ideas.