Form not saving data in listbox multiple selection on Reader 9

Hello all,

I've noticed a very strange behavior in my form.

I have a list box multiple selection, bound to a Schema. After I apply the usage rights using Reader Extensions, open using Reader 9, save it and open again, the form doesn't keep the previous selection and the field stays empty.

Any ideas why is that?

The strange point is, when opening the form, selecting multiple options in this field and then click CLOSE, the Reader doesn't ask to save the form before closing, as is hasn't happened any changes on it.

I appreciate any help.

Please find below the Form and Schema.

https://sendnow.acrobat.com/?i=Qk9H7iQzcGriM-*3uxpylw

Thanks!