What computer do you have?

Is it by any chance a laptop with no floppy drive? Perhaps one that has provision for an external floppy which you don't have plugged in?

I have such a laptop, and I have exactly the same problem. When I click on the /mnt in the file save dialogs, my floppy drive light comes on and the program hangs. I think if you wait a few minutes it will eventually keep going.

I fixed this by removing the link to the floppy device /mnt.

I had to do this using unlink, because trying to rm it had the same lockup problem.