Views Filters - Strange Behavior

I have created a View that filters on a specific Node Type and a Field that is blank on some of these nodes and has content in others. I want to filter out nodes where the field I am filtering on is empty. The Filter selects the nodes correctly. But I'm unable to find any field filter that will eliminate the nodes where the filtering field is empty.

And there is this bizarre behavior:

If I apply the "Is Empty (NULL) filter to the field I'm filtering on all of the nodes show up - those with content and those without.
If I apply the "Is Not Empty (NOT NULL) to the field I'm filtering on none of the nodes show up.

Any ideas?