I was thinking of another issue, for scanlines - try a different blitter:
DX9 alt w/SoftFX -> SuperScale 75% scanlines
Basic Blitter: scanlines 50%
Enhanced Blitter -> enable scanlines & set scanline intensity.
Some work better with different video cards. For example, the enhanced blitter's scanlines were awesome with my previous computer, but the new one scanline function doesn't work at all.. Probably because its onboard video...
best regards,
- dink