I have a gray box on the screen with gray button "Blocked Plug In". I can't click on or move/remove the box.
I have a gray box on the screen of my Mac book pro. In the center of the box is a button that is labeled "Blocked Plug-In". I'm not sure how it got there, but I can't remove or move the box or click on it. Pleas help me to remove this box.
MacBook Pro, OS X Mavericks (10.9)