"We're Having trouble Starting Oculus
Your Oculus software may be updating. Please wait a minute and try again. If the issue continues, contact Oculus Support"
Got the error, waited a few hours and reported to Support as suggested.
I have never had this before except when Oculus was indeed updating and over in a few minutes.
Support got back to me and suggested do a REPAIR which I did and all was good again.
Then is happened again this morning and I repaired again and once again all good.
Then this afternoon it happened again , so I did some digging around and closed off all startup services that could potentially (Why ?) interfere with Oculus.
Still no go.
I then looked at services (though Task Manager) and noticed the OVRService was not running so I started it and Hooray! managed to start Oculus up.
Anyone got any idea what would have stopped this service running ? Could it be anything to do with running a game via Steam ? (which was the last big activity before it happened the last time).
Anyway as a Tip, if you do get the "trouble starting Oculus" message , might be worth a try checking that the OVRService is running and if not start it before needing to contact support.