OptionButton Macro not functionning correctly

Hi team,


This should be an easy one but for some reason part of my macro is not functionning ONLY on windows XP machines..When I try on windows 7 everything is ok..

So basically the bellow code is supposed to take the value of my optionbutton (True or False) in a UserForm and if the value is true then it puts an X on tab Quality Grid
range G22..Why isn't this working on windows xp machines? Not giving me any errors ..the X just doesn't show after I submit form.

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