WU now requires you to enter a Camera Key in order to upload images. This is a new field that did not exist until very recently. You get your Key by going to your WU site and clicking on My Profile, then selecting My Devices. You will see your camera and a Key listed. The only way I know to provide the Key to WU is to upgrade your WeatherCat version to 3.1 Build 502, which is still in testing and not quite ready for prime time, but very close. It has a new field in your WU window to enter your Camera Key.
There is also a new field there called Name. It is required, so if that field is blank, you have to give your camera a name, in addition to the Camera ID you already provided to WU when you set it it up in the first place.
However, those of us running WC 3.1 who have provided the Key to WU are having mixed results. Some of us have not been able to upload camera images at all, even with the key. Others of us have had the uploads work fine for a day or two and then stop working for a day or two and then start working again. The issue, as with most WU issues, appears to be with WU rather than with WC. Even Stu has had mixed results, and he knows more about unloading to WU than the rest of us combined.
If you don't want to run WC 3.1 yet, there isn't much you can do. With earlier versions of WC, your camera uploads either work or they don't. Mine stopped working a couple of weeks ago. Isn't WU wonderful? Or at least it used to be, but not so much any more.