Display panel lores combined with superhires native mode is not anymore supported (It wasn't really working that well in previous versions either). Nothing is drawn in this combination.
Filter panel adjustments also affect GDI mode in real time. It still has ugly flicker. Use only if D3D9/D3D11 is not available.
Output D3D9/D3D11 texture was still locked when it was rendered. Old D3D9 drivers didn't like it (and was wrong in any case)
Integer scaling superhires aspect ratio correction didn't work.
If selected graphics API is not supported, test all other options. Previously failing D3D9 switched to GDI, even if D3D11 was available.
Interlace + TV overscan modes: extra black line was visible near the end of display. (fast optimized modes are not yet fixed)