I can confirm this on my Debian unstable with gnome-panel 2.30.2-4 for i386. I have this problem sometimes when the screen resolution is too small and the panel can't contain all the applets. For example starting a game with wine and the game changes the resolution, I obtain this bug. The funny thing is that it doesn't delete applets, it just change them position so the problem of containing applets still remains.
I can confirm this on my Debian unstable with gnome-panel 2.30.2-4 for i386. I have this problem sometimes when the screen resolution is too small and the panel can't contain all the applets. For example starting a game with wine and the game changes the resolution, I obtain this bug. The funny thing is that it doesn't delete applets, it just change them position so the problem of containing applets still remains.