Visio 2010. The VBA macro fills the shape's text.
The error lies in the fact that (sometimes!) the text is superimposed on the text of the master-shape instead of replacing it.
If a DoEvents statement is placed before the text is entered, the error disappears.
Fragment of the text of the program:
For i = 1 To DataColl.Count
Dim mas As Visio.Master
Set mas = Stenc.Masters("axis")
Dim shp As Visio.Shape
Set shp = TgtShape.Drop(mas, 0, 0)
shp.Cells("Width").FormulaForce = "Guard(" & BaseWidth & ")"
shp.Cells("User.angle") = DataColl(i).angle
shp.Cells("User.p1") = DataColl(i).p1
shp.Cells("User.p2") = DataColl(i).p2
shp.Cells("User.xBase") = xBase
shp.Cells("User.yBase") = yBase
' DoEvents
shp.Text = DataColl(i).aName
Set DataColl(i).shp = shp
Next
The master-shape contains the text of 4 symbols - "aaaa". The new text consists of one character.
After dropping master onto page, the program passes to the shape the data that controls the calculation of 1-D EndPoints and Angle.
I guess that it's Visio fault.
The picture below is animated gif.