An update for anyone thinking about upgrading to Mavericks:
After the upgrade WeatherCat and WeatherLink are both running as they should. So YAY (and whew).
I had a good scare, though: at first WeatherLink would not open at all. After I changed my pants I noticed an alert window hidden behind a couple of other windows that I had open. The alert said to download Java 6. Huh? I thought I'd been running Java 6 for a year and a half. But apparently there's been something like 45 updates to Java 6. Whatever. So I downloaded it and WeatherLink opened immediately thereafter.
My advice is to follow Blick's link in his second reply (above), and follow that advice on preparing your computer for the Mavericks upgrade.
It is well worth it, by the way; every bit as fast as they say. And now I can get Motion 5 -- the whole reason I upgraded in the first place
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