I've got one too wrote:
What model do you have? If the activity type is Run which is what he was showing on the screenshots HR is enforced and you can't start the session without it first having locked on to it. Please specify (a) what model and year of purchase you have and (b) how you do a 'Run' activity with HR turned off - specify the menu options you use.
Original cardio runner (from April 2015?). Start with hr off looking at time, right, choose "Run", right, right again when gps has locked.