>>My form has a data environment with table buffering = 2. The data-entry textboxes in the form have tablename.fieldname as their ControlSource. To add a new record, my add button Click event has the following code: select the table, append blank and execute a tableupdate(.T.).
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>>The append blank works, but no data goes into the table.

TableUpdate() is submitted AFTER data entries into the blank record and note that if you have another query accessing the table, it too must be requeried.