I've just purchased/downloaded Finale 18.104.22.168, which I'm running on a Lenovo ThinkPad T420 with Windows 7.
It seems to work OK.
However the palette tool icons are offset to the right from their buttons and seem cut apart at the button outline. This occurs with all the tool palettes (main, advanced, simple entry, smart shapes, etc.), and gets worse farther to the right (horizontal palette) and farther down (vertical palette).
I've tried closing and opening them, which makes no difference.