Ultimate Branding - PHP Fatal error: Call to a member function get_current_tab()

We have just updated the Ultimate Branding plugin to the latest version. (1.9.1). It is now throwing a php fatal error. in the httpd error_log the following error is given:

PHP Fatal error: Call to a member function get_current_tab() on a non-object in /var/www/schools_html/roseberryacademy.org/wp-content/plugins/ultimate-branding/ultimate-branding-files/classes/class.ub.helper.php on line 33, referer: http://roseberryacademy.org/wp-admin/index.php

I have enabled remote support access.

Removing all plugins does not fix the problem. I have disabled all plugins apart from ultimate branding and still get the same error. I have also restored the previous ultimate branding plugin files (1.9.0.1) from a backup taken the night before and still get the same error.

Thanks