TableModel refresh problem!

I am new to Java so any reply to put me in the right direction is appreciated.
I have inquired on New to Java, but the solutions received unfortunely did not help. I believe the
I need some help with the CellRenderer, but not sure.
I have a TableModel with 6 columns and the row count varies. I have also employed a sort model so that I may sort my display data by clicking the headers. Three of my columns are editable. Those columns are of JCheckBox: columns 3, 4, 5. At startup column 3 is defaulted to TRUE (Checked). Columns 4 and 5 are set to FALSE (no check).
For a specific row, if I click on column 4 (Checked), column 3 is set to FALSE (no check).
I call the method setValueAt from the method isCellEditable inorder to set columns 3 and 5 to FALSE (no check) when column 4 has been clicked. In otherwords, only one of the 3 columns for a specific row can be TRUE (Checked) at a time.
I can also sort my data by clicking on any of the header columns. The data always sort correctly.
Now about 5% of the time I have the following problem. Let say column 3 is TRUE (Check mark). I can click on Checkbox (col 4) which becomes TRUE (Checked) but the column 3 that is currently checked does not become unchecked. (Note: Debugging indicates this column is FALSE or should not be checked). Most of the time it happens when I Sort several times. But this not always the case.
However, *** if I drag another window over this display and take it away, my display is refreshed and corrected. Column 3 no longer is Checked.
I hope I have given you folks enough information and explained my problem well enough. Any suggestions or references to overcome this problem would be welcome.
Again thanks in advance,
[email protected]

call fireTableDataChanged on the TableModel, and the JTable will get re-painted

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