Still not sure I understand
this only advice I could give (from experience) is to blank out .RowSource before refill, then reassign:

.RowSource = ''
select ... into array thisForm.someArray
.RowSource = 'thisForm.someArray' && this refills .List[] where everything takes place

>>it'd be nice and usefull to know how your code populates thisForm.aQuantityTypes
>>
>It first selects data from SQL Server in the cursor and then re-selects from the cursor into the array in the method called from Form's Load.
>
>Also, I tried setting ColumnsWidth in design time and it didn't help. I haven't yet tried in run-time.
>
>But I just noticed that I have a value pre-set in this drop down. Not sure why I did that, I'm going to try removing.