"Kill the process, then go into the registry. Navigate to HKEY_CURRENT_USER\Software\Stardock\MyColors\ElementFire\Weather and change the 'xpos' entry to something like 300 or so. Re-run the gadget, and it should be back on the screen. Props to Shirley for finding this one."
You would have to navigate to HKEY_CURRENT_USER\Software\Stardock and then whatever area after that the widget registry is in, for OMNI time, but I think that should fix it for you.