I think this is usually caused by using the Microsoft Intellipoint mouse
driver. When I was trying to handle this MS told me their mouse driver was
not compatible with Autocad.
I read that the driver does something like occasionally saves a "screen
state" or something for a seldom used special mouse function that allows you
to return to that state.
Anyway, if you dump the MS mouse and get the Logitech MX Revolution mouse
with its driver, it works really well.
I have also heard that even with the MS mouse, if you use an older driver,
or a non-MS driver, it also fixes it.
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