I tested in other resolutions such as 1920x1080 and the HUD worked just fine. But for some reason it doesn't appear at all with the resolution that fits my screen perfectly: 1680x1050
Oddly, all the menus, dialogue and inventory windows work fine, they all fit the screen nicely but for some reason no HUD when I put it 1680x1050.
I've never had this bug with any game I've played