Tube Toolbox uses a built-in Internet Explorer browser that allows you to navigate around YouTube and find webpages to gather users/videos from. Like many people, we hate Internet Explorer but could not integrate Firefox or Chrome into the product because of limitations with building a product for Microsoft Windows.
From time to time people report various problems with the browser freezing or acting strange, etc. 90% of the time, this is because the version of Internet Explorer installed on your computer is not up to date.
Download and Install the latest version of Internet Explorer here:http://windows.microsoft.com/en-US/internet-explorer/products/ie/home