Maps not working in workout summary

All my old maps have disappeared and no new ones are being generated. The GPS is tracking me correctly during the workout but loses it all in the summary at the end. Very frustrating as this is the average speed figure I really want.

I can’t work out how to add an screenshot.

If I re-install will I lose all my old data?

I think I’ve mailed with you (?).
2.6.1+ app version should have fixed it.