VBA UserForm Combobox not dropping down

[TofuBug]

Been working on a rather extensive UserForm and all of a sudden when I run it NONE of the ComboBoxes will show the drop down portion when the little triangle is clicked on.

I can break on the code and SEE that the ComboBox is populated with values, I can TYPE in the ComboBox and it will change to one of the values just no visible drop down.

I'm not sure if the workbook is corrupt or what is going on.

Any ideas?