SDK 3.4.0 / xCode 6 - "invalid "--developer-name""invalid "--pp-uuid"

Hi,

I upgraded to SDK 3.4.0 / xCode 6 at the weekend and now I can't Archive apps within xCode. I constantly get the error message: https://dl.dropboxusercontent.com/u/16194411/Screen%20Shot%202014-10-12%20at%2022.27.17.png

Essentially… [ERROR] : "invalid "--developer-name" value…. [ERROR] : "invalid "--pp-udid" value…. Command /bin/sh failed with exit code 1

I've cleaned projects, reinstalled certificates, reinstalled profiles etc to no avail despite the fact they were all working previously on 3.3.0 / xCode 5 Has anyone else experienced this?

Thanks, Andy