P.S Also Mike in my previous post I had requested the clean slate theory. How do you work it. I dont have the option in your step 6 to delete local data. Just cant locate it!!
Sorry for the delay in replying had last week off work and been playing catchup with everything.
Carrying on.....
It's not so much a clean slate for all of cortana/preferences. All it does is delete anything pertaining to cortana and your settings from the local cache on the phone. I'm guessing the option is there when switched off to help easily free up space if you weren't planning on using Cortana for whatever reason (every MB counts on a mobile device after all).
Suffice it to say in that clearing that cache you're forcing Cortana to fully download everything to do with her settings and your preferences from scratch. This then seems to clear up any issues with chat chat and interests not working as they should be.
As for the option to delete the local cache not being there it should be displayed in the location specified provided Cortana has been turned off and the handset restarted.
I can see you got the language and region settings right in the end. I have added a table in the second post outlining the correct settings needed to make Cortana work in the countries she is available in and will try to keep it up to date as more become available or change status from alpha to beta etc.
Also need to put this out there can anyone provide me with the correct settings for China and i will get that updated?