Hristo,

I got this to work. I made few changes to the code you included in your example:

1. Removed this from Initialize Layout:

myGroup.RowLayoutGroupInfo.LabelPosition = UltraWinGrid.LabelPosition.LabelOnly

2. Added this in Initialize Layout:

band.PerformAutoResizeColumns(True, UltraWinGrid.PerformAutoSizeType.AllRowsInBand, True)

3. In HeaderCellExporting, ensure sizing is only done on the last column in the group:

    Private Sub exp_HeaderCellExporting(ByVal sender As System.Object, ByVal e As Infragistics.Win.UltraWinGrid.ExcelExport.HeaderCellExportingEventArgs) Handles exp.HeaderCellExporting
        If Not e.GridHeader.Column Is Nothing AndAlso
               e.GridHeader.Column.Index = e.GridHeader.Column.Group.Columns.Count - 1 Then
            e.CurrentWorksheet.Columns(e.CurrentColumnIndex).Width = (e.GridHeader.Column.RowLayoutColumnInfo.ActualCellSize.Width) * (256 / grd.Font.Size)
        End If
    End Sub

This resulted in a correct export:

Thanks for that. This is not enough to trigger the bug. You need this line in InitializeLayout (which is vital for me):

band.PerformAutoResizeColumns(False, UltraWinGrid.PerformAutoSizeType.AllRowsInBand, True)

This is what kills it. Without this, the columns are wide enough to start with so the issue does not come up. The auto resize reduces the width of the columns and now the group text does not fit in Excel.