When I go to certain websites and attempt to navigate through drop-down menus, the menu begins to flicker and things start to disappear and reappear, making it difficult to find what I'm looking for. I don't recall this happening a couple months ago. I have deleted and reinstalled firefox twice. I have cleared the cache and all history. I have downloaded the most recent version of Flash, and JavaScript is enabled. This is mainly a problem on my company website, http://fullcirclephoto.com/gallery/ and I have not experienced the problem on other computers. I have also noticed this issue when I visit hulu.com