Thanks for the reply DS.
Here are some of the messages from the Console Log:
07/10/2014 15:30:59.149 Console[2173]: Marker - 7 Oct 2014 15:30:59
07/10/2014 15:31:05.565 CoreServicesUIAgent[2219]: Error -60005 creating authorization
07/10/2014 15:31:06.358 com.apple.xpc.launchd[1]: (com.apple.ReportCrash.Root[2394]) Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash.DirectoryService
07/10/2014 15:31:06.762 loginwindow[2140]: ERROR | -[LoginApp windowServerExited] | Window Server exited, closing down the session immediately
07/10/2014 15:31:06.763 rooksd[47]: On-demand launch of the Window Server is allowed for root user only.
07/10/2014 15:31:06.763 rooksd[47]: CGSLookupServerRootPort: Failed to look up the port for "com.apple.windowserver.active" (1102)
07/10/2014 15:31:06.763 rooksd[47]: Window Server is not available.
07/10/2014 15:31:06.764 rooksd[47]: On-demand launch of the Window Server is allowed for root user only.
07/10/2014 15:31:06.764 rooksd[47]: CGSLookupServerRootPort: Failed to look up the port for "com.apple.windowserver.active" (1102)
07/10/2014 15:31:06.764 rooksd[47]: Window Server is not available.
07/10/2014 15:31:06.765 rooksd[47]: On-demand launch of the Window Server is allowed for root user only.
07/10/2014 15:31:06.765 rooksd[47]: CGSLookupServerRootPort: Failed to look up the port for "com.apple.windowserver.active" (1102)
07/10/2014 15:31:06.765 rooksd[47]: Window Server is not available.
All looks far too complicated for me!
I do see things like "Error -60005 creating authorization" and "Endpoint has been activated through legacy launch(3) APIs"
I don't have any other User Accounts on my MBPro.
I do on my iMac, need to check whether they get the same problems.
Many Thanks.
Beta 5 out now but it stil hasn't fixed this...