Peter,
I saw that, thank you.
At the bottom of that article it states, "Vectorworks 2012 and earlier: If you are using Vectorworks 2012 or earlier, we do not recommend that you update to OS X Yosemite, as these versions will not run properly with the new OS."
They said the same thing about running VW2010 on Mountain Lion and we're not having any problems.... tempted to try it.