my pictures are disappearing

Need a LOT more information:

What is your OS (and what release)?

Which version of Bridge (and what release)?

Where are the pictures (desktop, external drive, camera card,??)?

Just so you know,  unless you intentionally delete an image or file in Bridge, the images will be where they were before. But something is making them not visible in Bridge. Just because something is not visible does not mean it's gone — just ask any magician. ;>)