Hi- I'm currently using Firefox 18.0.2 on 2 different computers (Both Win7 64 bit), both with flash 11.6.602.168. Both have roughly the same programs installed and the same browser configuration. However, on one machine, flash works only on some sites. For instance, Youtube works perfectly, as do dedicated flash games. However, sites that use embedded flash applications fail to work. For instance, if I visit www.speedtest.net, where the test options normally appear is completely blank. Similarly, other video players fail. For example, videos in www.cbsnews.com play sound, but where the video should be is just white. I've tried completely uninstalling both firefox as well as flash, and installing previous versions, nothing has worked.