Can't get registerpage to be visible

I have asked this question before, and then got a reply that did not solve the problem. This was three days ago. Now I am desperate because I need to get membership to work within this week. The link to the question https://premium.wpmudev.org/forums/topic/the-registration-page-doesnt-show-up#post-684566

My problem is that I can't get registerpage to be visible. This happend when I changed from membership lite to premium. Before I had no problem with this.