The gnome weather applet works fine for a while then hangs and does not respond to mouse clicks. The applet display seems to freeze too. The rest of the panel applets seem to work fine. I have to kill the gweather process, add it back to the task bar, and reconfigure it in order to get it functioning again.
Is your network running when this happens? Does it still happen with gnome-applets-1.4.0.1?
The network was up and running OK when I had these problems. I don't know if gnome-applets-1.4.0.1 will fix the problem. It has been nearly 10 months since I reported the problem. I stopped using Gnome in favor of KDE several months ago.