I'm running DF 4.0.11.14620 on DNN 5.6.7 and I think there is a minor bug with respect to the way that you move question options in the combo box. When adding a new question option and selecting the position in the list on where to add the option it seems to be working as expected.  If you already have a list defined and you need to reorder the existing items the "Move Option" dropdown says "After xxxx" where xxx is the value defined.  It seems that the behavior of the update is that the question option is moved before the selected question option, rather than after as the action suggests.  It can be a bit confusing, but it seems the fix may be trivial by changing the wording.