Why do I suddenly need to re-master almost every skill? Looks like a bug.
Okay, I have gone back and remastered a bunch of skills. It appears that there have been more exercises and points added to the skills that were lost. Having remastered the skills I also scored additional points. So, it might not be a bug but new additions to the exercises and skills we already mastered. I have no objections to that - after all, exercise makes perfect - but I still would like to have the owl back!