Ultimate Member Time Out server

Does anybody have the Ultimate Member plugin working properly on a shared web server?
I spent almost one month developing a project based on this plugin localy.
But, when I uploaded it to my server, it just don’t work.
When I try to subscribe or login to the website, it gives me a “Forbidden Access” message.
And even worse, after that, it starts to make any request to my server become a “Timed Out” request.
So, I cannot acces any thing else on my server after using the plugin.
I searched at the forums and also the Internet (Google).
No answer.