I have tried everything to reproduce the error but could not. Is it possible that there have been some special characters in the route filename or training title? Just an idea ... Or it it a browser problem? Maybe the content of some of the boxes got too big and couldn't be displayed. Could you post a screenshot it it happens again?
I have observed that when I navigate by route live tracking provide only infirmation about position on the map. All the info boxes are empty. When route navigation is turned off, everything works correctly.