I'm currently working on Challenge 3 and am dealing with trying to fix this error:
Challenge Not yet complete... here's what's wrong: 
The report 'Open Support Cases' contains records of the incorrect status. Please check the filter.
 
For the Open Support Cases, I created a Custom Report Type linking Accounts and Cases and have the groupings and fields set up as specified. For the filter, I've tried "Closed equals False" and "Status not equal to Closed" for the Cases, but neither of those worked.

If anyone who has passed this challenge can provide input on what's wrong with this report. It'll be much appreciated.

reference error id: DPFVJULB 

All modules (before and after this one) verify fine!  The flow works perfectly.  However, this one will not verify...I get an error that tells me to try it in a new DE.  I hate to start over and get the same issue when everything around it works fine.  Is it just me?

I'm doing the simple lightning components challenge and have hit this problem in my existing trailhead org and a brand new dev org that I've just created:

Challenge not yet complete... here's what's wrong: 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: QVWBQHAG