I am using OS 10.5.3 on a MacBook Pro. For some reason this afternoon the Downloads folder in the Dock decided to disappear. Tinking it would be simple to just grag it back down there, I did so from its Home location. It shows up and has the blue folder with the shaded down arrow pic on the folder but seconds later is turns into another app's file icon. I have tried this several times and I get the same result. Does anyone have an idea what is going on?