Daniel, I too, use GNOME's fallback mode (aka 'gnome classic') with an old video card, and fail to reproduce it. (I think the 'unreproducible' tag means that we don't yet know how to reproduce the problem on *other* environments, therefore the tag is justified)
Can you please kill nm-applet and run it from the console, and paste its output, as Michael asked? (hopefully we'll see a meaningful error) -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org