To solve this problem, please take the following steps:
- Open builder in Chrome or Firefox browser;
- Open developer tools in browser (key F12);
- Switch to "Network" tab;
- Click on "Save" button in builder;
- Click on appeared request line (it should begin with "?sess=");
- Switch to "Response" tab;
- Copy text you see in this tab;
- Create ticket on MyHost to tell us about "error loading page" and paste copied text. Our support team will respond to you as soon as possible.