Same here, using nv X server on nVidia RIVA-TNT with 1680x1050 screen resolution, but the same effect appears when running it in 1024x768 or 800x600, all with bit depth 16. The splash image is skewed identically to the one shown in the original attachment.
Back at the origila 1650x1050, at bit depth 24 the splash image
appears correctly, while at bit depth 8 it comes out flipped upside
down (attached).
Hope this helps you reproduce the effect
M
<<attachment: oo3-logo-8bpp.png>>
