@sofy ok. thanks

I will have to remove that admin account because i don't feel safe to have it for a long time, with id and pass exposed on the internet.

@sofy   user: wpforo pass: Aq#dBw4EVPMSOlC8    

Ok, still in my case the Login / Register doesn't happen for some reason .... I only care for visitors (guests).

I did. There is NO message displayed. Only the login/register popup (that in my site doesn't even show).

Create an account and i will switch it to admin group asap. I have the same issue in my test worpdress site, empty, no plugins, nothing.

You mean wpForo cache ? No i did not. Just did it. But i think i have tried all that, all caches, disabled all plugins that could conflict. No luck.

Sure, disabled now. Still i have tried all that, no luck.

Ok, here it comes. Plently of attachments

Sure, please make it private. Thank you

Is you go to Wordpress dashboard / Media / Add New, what max size is reporting ? Can you upload in there correctly ?  2019-09-19-23_06_34-Win...

Ok. Apparently this is a hosting setup error, contact Siteground about it. This is the second glitch i read here this week related to wrong setups in ...

Ok, what happens if you set it to EXACTLY 20 mb ? Is still an error there ? And what exact error (what size) ?

Can you remove the 128 mb you have put in there and put something like 20. Maybe 128 is confusing the script. ..... and no one will be able to upload ...

Well the error shows 128 BYTES not MBytes.