After installing both the
theme-my-login plugins, the testimonials widget title is overwritten--i.e., is in conflict with--that of the theme-my-login login page title when a user is not logged in.
The issue lies on line 40 of testimonials-widget-widget.php:
$title = apply_filters('the_title', $instance['title'], null);
While this code works for the most part, I believe the tag that should be filtered is
$title = apply_filters('widget_title', $instance['title'], null);
This fix remedies the widget's title and allows the title to be properly displayed across views.