Vista - Text Disappears On Mouse Enter or Mouse Leave

Has anyone seen this behavior before? If I create a simple Windows Forms
application with a TextBox, with at least one Scrollbar, inside a
SpitContainer, on a TabPage, the text disappears when the mouse enters or
leaves the TextBox. It does not occur if the Scrollbar, SpitContainer, or
TabPage are missing.

I can reproduce this in a simple test application that is constructed
entirely in
the designer within Visual Studio, with not one line of code written by me.

It happens on a machine with insufficient graphics to run the fancy graphics
features of Aero, and only if I use the "Windows Vista Basic" theme, rather
than the "Windows Classic" or "Windows Standard". I do not have another
Vista
system on which to test my application, so I do not know if this will occur
on a system with better graphics.

A work-around is to call TextBox.Invalidate() on MouseEnter and MouseLeave,
but this solution is not entirely satisfactory.

Has anyone seen this?