PopupMenu not showing right arrow for nested menu items

Hello, I''m using v3.3 PopupMenu and have noticed a strange issue on one of my user''s PC The right arrow is not shown for nested menu items. The gray area to the left is present and so are any associated images. The user can still click on the menu item to see the nested menus It works OK on other machines. All assemblies are of the same version. The only major difference is that his PC has dual monitors It''s very odd. Any ideas? Thanks Jason

Loader.
Up arrow icon