I have a custom lightning component with a couple of lookup fields.  

On Thursday, they were working great in sandbox and in production.  Today, none of them are returning any results.  I type in some characters and no records are returned for selection.

Does anyone have any ideas of why?  We haven't changed anything in either org.  And none of the lookup fields are working right now (there are 3 on the page).  It doesn't seem like a code issue.  It seems like a Salesforce issue, but I can't know for sure.  Nothing I search for returns any help.

Thanks for any insight into this.  

I created a new org directly from Trailhead and went through the modules.  The first two checked out, but I got stuck at the 3rd one with the error below.  Thanks for any help.

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: VQESBLAI

 

Hi,
According to the requirement of Project  I have created Lense named worldwide_sales_with_flags. But still I am getting the error: