So after the nstar reset feature got added in I noticed I am having issues navigating through the different challenges. Wont let me look through the challenges as I was previously on Advanced. And it is showing "Complete 0 more Competent challenges to unlock this level" but i cant click on the books for novice or expert or advanced. I was able to do this yesterday as I have been working on Advanced challenges.

 

It looks like if you do one of the challenges which you currently have 0 done for then it will move you over to the next set of challenges you already completed. But if you do a challenge you have done before for example (1 out of 100) then it wont take you to the next set of challenges. Which i should already see cause i unlocked them yesterday.