Since yesterday's system "upgrades" when in the player view of an activity, the top screen (where it displays heart rate, elevation, speed etc), the graphic display is all screwed up, with multiple lines appearing etc. Interestingly, this seems to be happening only with my run data which is from a Forerunner 405, whereas my ride data (from an Edge 500). Also, the second half of a run recorded on my iPhone Garmin Fit app (the forerunner ran out of batteries!) displays ok (the first half, with the Forerunner the display is "screwed up").
This issue seems to affect all my old run data as well as recent ones. They all displayed properly, up until now.