This most likely occurs because the secure cookie that was placed within your browser's files was removed. This can happen if you delete cookies from your computer. This is a common method that anti-spyware software uses to remove potentially risky items from your computer. These solutions typically remove ALL cookies as a precaution, even though very few cookies are actually security risks. In order to use this feature without being asked for additional information at each login, you'll need to change the settings in your anti-spyware software or browser to keep any cookies associated with Tower in your browser’s settings.