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can't find custom externalID field for Data Loader Upload

I've added custom field to Opportunities and set it as a unique external ID.  In the Salesforce application I can see the field.

When I try to upload a value to it using Data Loader, the custom field does NOT show up to allow me to match it to my CSV file for upload.

I've used the same technique for Products and it worked fine.
I closed the Data Loader and reopened it.  Now all is fine.