Problem with pages

Hellow

I have recently installed the newspaper theme and I have a problem creating pages. Every time I create a page is blank if you viewed Preview when editing. If you want to eventually access it once published, also appears blank. Even when installing the demo theme the server stayed locked and I had to delete all created pages. Creating post don’t appears to have the same problem.

Anyone know what could the problem be?

Thanks.

Turn off all plugins,
switch back to default theme twenty-fourteen or whatever;
try to create a page.

If you can create a page,
turn on Visual Composer and no other plugin.

Turn on the theme again.

Turn on your plugins one by one to find the one breaking the site.