Different behavior with the ComboBox from 1.1 and 1.1SP1

  We have identified a bug in SP1 (version 1.1) of the framework that Microsoft has documented.

Comboboxes are exhibiting a different behavior in SP1 then on a machine that does not have sp1 installed. 

In our case, it causes all bound controls on a windows form to clear, though the data is really there.

This is an FYI in case you are experiencing this too.  It took us a while to realize the difference between when it works and when it does not was SP1 being installed or not installed.