When trying to save a bookmark to a specific pre-established folder the window disappears and will not allow me to make a selection. If I hover in the area it will flash on the screen and disappear again, it's annoying please help!

When I attempt to save a new bookmark and want to save it in a folder the window that typically appears just below the address bar will not stay on the screen. It flashes on the screen and as soon as I move my cursor over it, it disappears. It will not allow me to make a selection of any kind. If I randomly hover over the general area the window will flash back in view but disappear again just as quickly. If I then show all my bookmarks, the bookmark was saved and I have to move it to the folder I actually want it in. Just a few extra steps, but still very annoying. Please help!