Hey Lee, I'm getting the same error message over here. Same extensions versions, DW CS6, latest version of Yosemite (GM3). I'm also getting the same message running CS6 in Mavericks running via Parallels on the same machine. I've only installed Mavericks via Parallels so I could continue working on my sites. That worked for a bit but has since stopped. Keep the thread up to date if you find any solutions. I'll do the same.