I turned on LOGs in config.php and received message Call to undefined function hash()
I applied PHP module HASH (on my hosting in PHP settings) and now site is working. Widget menu is ok.
But still don`t see TubePress settings in Settings menu. And can`t configure it.
[shortcode] on my web site shows
Guzzle requires cURL, the allow_url_fopen ini setting, or a custom HTTP adapter.
After that I applied allow_url_fopen (on my hosting in PHP settings) and everything works!
Good luck everybody!Go to the full post