Lookup fields stopped working today

Lookup fields stopped working today

I have been running my app for almost a year now, no changes on my end.  Today my lookup field to lookup field stopped working.

I have a Category and a Product lookup field

Category is selected first  I have about 7 categories (flour, sugars, spices.....)  I select flour and the next field should limit the Products to just the Category of flour,  but today it saying "No Matches Found"  I havent changed anything on my end.  I look at the FILTER section on the Products field and it has SET FILTER checked and my filter is set to Category.ID == input.Category.  What broke?  How do I get this working again?

I used 
https://www.zoho.com/creator/help/fields/configuring-conditional-drop-downs.html

to set this up a long time ago.

Thanks
Andy