More information about this problem:

It seems to be more of a problem when the RowSource is Array and ControlSource is None. I have RowSource Fields working in some comboboxes, so I will be able to determine why that one combobox that is Field-based does not work. It seems that the comboboxes that work all have a ControlSource whereas the Array combobox does not. Is that why I am having the problem with the Array combobox background color settings?