403 Forbidden

Every time I try to open a message or post a project, whether I do it in the same window or in a different tab, it opens a blank page with only the message 403 Forbidden.
I can't post projects or respond to messages from my clients. This does not happen to me with any other page, only here in CGTrader. I have checked that there are no problems with the firewall, I have deactivated the antivirus, I have tried only to open the page when restarting and nothing has worked, I have also seen in the general section, that I am not the only one who has this problem.