I have an app that manipulates word docs. I have some code that adds
tables to a document. I have been working on this application for
about a month now and all of a sudden every doc that I attempt to run
my code on throws the error in the subject line. Over the course of
the month I have seen this error intermittently but since last night
it happens on every doc. If I go back 3 weeks and get a version of the
program that never experienced this problem in the past it is
experiencing it today. This leads me to beleive it's not the code, but
I would still appreciate any comments on the code I can get.

Here is what the code looks like that is having the problem:

Document aDoc = _wordApplicationInstance.Documents.Open(ref
letterPathAndFile, ref missingValue, ref falseValue, ref falseValue,
ref missingValue, ref missingValue,
                                               ref missingValue, ref
missingValue, ref missingValue, ref missingValue, ref missingValue,
ref falseValue);

try
{
       // field codes have to be on for this portion of the searching
to work
       aDoc.ActiveWindow.View.ShowFieldCodes = true;

       // track revisions has to be off or it messes up the logic
       aDoc.TrackRevisions = false;

       // if found, we know where our start point is now for
inserting our table
       // if we didn't find it we don't have our starting point and
if that is
       // the case we cannot continue.
       if (beginning.Find.Found)
       {
           object start = 1;

           object autofitBehavior =
WdAutoFitBehavior.wdAutoFitContent;

           Table theTable;

           try
           {
               //object missingValue =
System.Reflection.Missing.Value;

               // put our table here
               Range tableLocation = aDoc.Range(ref start, ref
start);
               int columns = 3;
               int rows = 1;
               theTable = aDoc.Tables.Add(tableLocation, rows,
columns, ref missingValue, ref autofitBehavior);

               formatTable(theTable);
           ........

private void formatTable(Table theTable)
{
   theTable.LeftPadding = 0.0f;
   theTable.RightPadding = 0.0f;

   // eliminate table borders
   theTable.Borders.Enable = 0;
   theTable.Borders.Item(WdBorderType.wdBorderBottom).LineStyle =
WdLineStyle.wdLineStyleNone;
   theTable.Borders.Item(WdBorderType.wdBorderDiagonalDown).LineStyle
= WdLineStyle.wdLineStyleNone;
   theTable.Borders.Item(WdBorderType.wdBorderDiagonalUp).LineStyle =
WdLineStyle.wdLineStyleNone;
   theTable.Borders.Item(WdBorderType.wdBorderHorizontal).LineStyle =
WdLineStyle.wdLineStyleNone;
   theTable.Borders.Item(WdBorderType.wdBorderLeft).LineStyle =
WdLineStyle.wdLineStyleNone;
   theTable.Borders.Item(WdBorderType.wdBorderRight).LineStyle =
WdLineStyle.wdLineStyleNone;
   theTable.Borders.Item(WdBorderType.wdBorderTop).LineStyle =
WdLineStyle.wdLineStyleNone;
   theTable.Borders.Item(WdBorderType.wdBorderVertical).LineStyle =
WdLineStyle.wdLineStyleNone;
   theTable.Borders.OutsideLineStyle = WdLineStyle.wdLineStyleNone;
   theTable.Borders.InsideLineStyle = WdLineStyle.wdLineStyleNone;


theTable.Columns.Item(1).SetWidth(_wordApplicationInstance.InchesToPoints(4.50f),
WdRulerStyle.wdAdjustNone);

theTable.Columns.Item(2).SetWidth(_wordApplicationInstance.InchesToPoints(1.14f),
WdRulerStyle.wdAdjustNone);

theTable.Columns.Item(3).SetWidth(_wordApplicationInstance.InchesToPoints(1.14f),
WdRulerStyle.wdAdjustNone);

   theTable.Cell(1, 1).VerticalAlignment =
WdCellVerticalAlignment.wdCellAlignVerticalBottom;
   theTable.Cell(1, 2).VerticalAlignment =
WdCellVerticalAlignment.wdCellAlignVerticalBottom;
   theTable.Cell(1, 3).VerticalAlignment =
WdCellVerticalAlignment.wdCellAlignVerticalBottom;

   theTable.Cell(1, 2).RightPadding = .5f;//
_wordApplicationInstance.InchesToPoints(.50f);
}

the error occurrs on the following line:

theTable.LeftPadding = 0.0f;

The stack trace looks like this:

"   at Word.Table.set_LeftPadding(Single prop)\r\n   at
formatTable(Table theTable) in C:\\DocUpdate.cs:line 514\r\n   at
updateLetter(Object letterPathAndFile, String directory) in C:\
\DocUpdate.cs:line 335"

It's written in c# and I know that this is the word.vba group but
there was no word.csharp group and this seemed more appropriate than a
non-word group as I think it's a problem in the word object model that
I'm experiencing.

(I've rebooted several times to no avail)