Plex, I just updated today builds 35, 37, 40, 41 old, 41 new, and 42 for tests I was running, and specifically watched that splash screen each time. Are you positive you are running 41 or have you an older copy on your Mac that is running? Right-click on the icon in your dock and select "Show in Finder" and see if it is the same copy that is running when you go into the Applications/wdisplay/ folder and double click on the WeatherD icon, ok? I have done this before where I clicked on the dock and it started the old WeatherD I have moved to my desktop. Leopard and Snow Leopard kep track of the movement of files so that when an alias of that file is clicked, like in the dock, in many cases it will still find it (defeating my intention lol)
Hope this helps,
Jim