Help! Smart groups not working

I am using Endnote X8.2 on a Macbook (OS Sierra). Randomly, smart groups have stopped working for me - they will not pick up anything. No matter what I type in, no references appear in the group. It worked before and I don’t understand what the issue is - can anyone help?

I think you need to contact Clarivate, if you haven’t already.

Tony M. (Technical Support Representative), recommends contactingTechnical Support 

1-800-336-4474 option 4 then 1  (week days I think)

or

https://support.clarivate.com/Endnote/s/technicalsupport?language=en_US

They are there to help whenever you run into issues.