Problems with acces

Some times I have problems. with the users. I´m tritying to find the reason why some times I can not log out or acces to some pages (maybe is a plugin issue).

So far I did found an issue. My installation have https , but if I do try to create a new blog (not as super admin, as users at wp-signup.php) the page send me out, i must copy and paste the url with the missing S and it works again