Are the indexes CDX (TAG's) or individual IDX files?

>I have a form that has a table in it that doesn't get the index updated when a record is added. The form is setup as a private data session and buffering set to optimistic. The table is setup with optimistic row buffering. The data is in the table. Set order to allows you to view the record that was added. Set the order to any of the indexes on the table and you can not view the record. Does anyone have any suggestions for a fix?
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>Thanks,
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>Warren