Thanks for responding David. No, pop-ups are not blocked in my browser.
When I go to a multimedia site such as
www.videodetective.com, I'll see an image for a split-second and then the image or movie will disappear or go blank. When I move my cursor to the area where the image or movie was, the cursor doesn't change from an "arrow" to a "hand", thus enabling a further function such as enlarging an image or video/movie controls.
I hope the above has been helpful in describing my problem. Thanks again!