@far-blue I experienced the same issue at the weekend (on latest software version) even after uninstalling the app/rebooting the watch & closing he app numerous times.
I was about to give up when it randomly worked…
I’ve just tested again & it will NOT load at all now despite being the only app in the watch (Race)
When it loads it’s a great app but I’d like to see the alert font making bigger & the number of ‘events’ increasing as currently an alert every 30 mins is only good for anything up to 10 hours unless someone knows how to restart it without having to stop, save & restart the exercise recording ?!
Both of the above shouldn’t be a massive job & will make the app even better👍