Running on a fresh upgrade to Yosemite! (Not a clean install.) Everything is running just fine.
Computer: Late 2011 27" iMac 2.7 GHz i5, 16 GB RAM
OS: Mac OS X 10.10 Yosemite
Hardware: Davis wireless Vantage Pro2 Plus w/24 hour FARS, wireless anemometer transmitter, Leaf & Soil Temp/Moisture Station, Weatherlink USB data logger
WeatherCat version: 2.0.0 (build 4475), USB driver: CP2102 USB to UART Bridge Controller.
Steve