Even with gesture response on high it won't respond to rotating wrist rotation. It just arrived & I charged it, it did an update & I set it up. Reading the manual, it says set gesture response to high. Done. Still no response.
Double tap wakes it, but it goes blank almost immediately, even though that setting is now on long.
I have seen comments that you have to update and or connect to charger to clear this bug, but it recurs regularly. This is not a viable solution if you are not next to a power source & carrying the charge cable!
If I can't get a workable solution, it will be returned straight away! That would be sad for me, as I loved my Forerunner 15, now unsupported & I hate my replacement Fitbit!!! (although at least the Fitbit works, even if ugly & uncomfortable, with poor connectivity to imobi!)