3D Wavetable map displayed incorrectly in Halion 6

The 2D wavetable map displays correctly but the 3D wavetable map only displays the top left quarter of the map.
I’ve had this problem since I installed Halion 6 some months ago but I thought it would probably go away when I set up on a new PC.
I’ve finally got my new Windows 10 PC and the problem is the same.