Arnie:
    I don't know which version of the rtb you have. The current version is 6
(service pack 4). I put this code in an MDI child form and tried it. Even
with re-sizing the width of the child window, and thus resizing the rtb, the
text remained fine. All I did was change the ScrollBars property to
rtfVertical. Otherwise, the control uses all of the defaults.
    I made the child form and control as follows:
        Form1.Height = 4110
        Form1.Width = 2895
        RichTextBox1.Height = 2655
        RichTextBox1.Width = 2535
        RichTextBox1.Left = 120
        RichTextBox1.Top = 240

    And put Command1 below the rtb. The above settings were put in the
properties window, not set programmatically. And then the code:

Private Sub Command1_Click()
    txtSample = ""
    For LoopVar = 1 To 10
        txtSample = txtSample & "This is some longer text to see if it cuts
off properly and see if it breaks words that are too long like
supercalifragilisticexpialidocious and
supercalifragilisticexpialidocioussupercalifragilisticexpialidocioussupercal
ifragilisticexpialidocious and if it works with the vertical scroll bar as
it should. "
    Next LoopVar
    RichTextBox1.Text = txtSample
End Sub

Private Sub Form_Resize()
    RichTextBox1.Width = Form1.Width - 360
End Sub

    If this doesn't work then you should check your version (previous ones
had bugs) or, specify what is done differently than I did.

Doug