The widgets won’t work

when I want to publish the article that contains text and pictures, I add widget SiteOriginEditor that deals with text and SiteOriginImage that deals with pictures. And they both won’t work. It takes a lot of time to open the widget. I mean any widget. I’ve reset the Plugin system but it didn’t help. What is the problem and how can we solve it?

when I open the site it is often showed “Error 505” or “The page isn’t found”. How to solve this problem?