@admin Hi Max,
Just started riding again. I didn't rerun the workout but have been using it for other workouts since then without issue. I'm wondering is this was a CPU issue related to Win10 wonderful updating during usage. It's a 7 year old dual core laptop with 6GB memory.
On the history aspect. I deleted all my old workouts (fit) in the History folder. When I looked at the workout list after refreshing, it still showed the workouts I did previously as 'Done'. I found the right-click, 'Select as undone' option and removed them as done so now I see only my current workouts as Being accomplished. No worries for now.