Is the HUD definitely there? Can you see it when you move the table, for instance?
You shouldn't really need the "always on top" option - try turning that off. I wouldn't expect that to make it any better, but it shouldn't make it worse and it isn't really necessary.
IIRC the 'always on top' option is pretty recent, so I guess you have a current version of PT3? If you're not using v3.11.2 Beta please update though.
Download pagePT3 Build History / Release NotesAlso check that you have the latest drivers for your graphics card - out of date drivers can cause issues like that.
If you still have the problem please
report your problem so that we can investigate further.