Can't see custom Zoho CRM Tasks fields in Advanced CRM Analytics report builder even though we're set to auto-sync

Can't see custom Zoho CRM Tasks fields in Advanced CRM Analytics report builder even though we're set to auto-sync

We have setup Zoho Reports so that it syncs automatically, every 24 hours, with our CRM database.

We created several custom fields in the Tasks module several weeks ago that I can not see in the Report Builder. This is strange behavior, as I *have been* able to use custom fields in reports on many occasions before. For some reason, I am not seeing them now.

Also, since we are automatically setup to sync, I don't have the option to do this:  Setup >> ZohoApps >> Advanced Analytics >> Settings >> Opportunities >> make sure your custom field is listed and checked off as part of the sync.  

Can someone please advise?

Many thanks,
Kim