In firefox, it happens when saving a image. As I noticed, not all the directory switching actions will trigger the bug. The current directory (location before you switches) should contain some individual files of a certain type, then when switching action happens, the filename is replaced by the first individual file's name in that directory before disappears, which takes only .5 seconds or less.
I attached a video(screencast) in the duplicate report showing two consecutive switching actions, of which only one triggers this bug. But unfortunately the video can not catch the filename replacement before disappearance. The video could be found here: http://librarian.launchpad.net/7044342/nautilus-save-as-bug.ogg -- [Feisty] File save dialog delets filename when changing directory https://launchpad.net/bugs/93396 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
