[elmirage001]

After updating the membership option keep proceeding through the Special Bonus process until you can click on the Finish Button. After clicking the Finish Button go back in and see if it keeps your membership choice including none of them highlighted.

I first selected a membership clicked update and went through the process until I clicked Finish. I went back in and it held the membership choice. I then deselected that membership choice so that none were highlighted and clicked update and proceeded until I could click the Finish Button. When I went back into the Special Offer the Customer has a certain membership checkbox was checked and none of the memberships were highlighted. I don't use Special Offers so I did not do any further testing.