Try to get him to remove the skin by using the following parameter
code:
/PlusSkin=deafult
Add this at the end of the "target path" when you right-click -> properties. (don't forget the space).
After they load it, i recommend removing that or else they will keep removing any skins they add.
Hopefully with the default skin they will be able to see the two buttons. Please let us know how it goes.