Column Grid and custom edit column combo problem

We just updated our project to the latest release, and i have now seen in multiple forms that where I use a TAdvColumnGrid with a TColumnComboBox as a custom editor, when the combo drops down, it immediately drops up again, preventing selection from the list. Worse, I see the value from it written to the cell in the row above the row where the combo was opened.

This is a problem urgently in need of solution, as I have many instances of this model in a very large application.

Please contact us by email with detailed instructions, preferably some sample project source with which we can reproduce this issue here. With just this description, we do not have sufficient information about how exactly you use the component.