Dont Work with WP 4.4.1

Hello, When I update my WP Page from 4.3.2 to the newest update 4.4.1 the page have not longer a title in the browser. The Browser shows only the url and not the name of the selected page or the homepage. I tried a new install WP 4.3.2 but without any other result. Is it possible to make this Theme ready for WP 4.4.x ?