1) I can't see *any* vertical tearing in either mode, thus I'm suspicious it's truely Flip 0.
It is truely Flip 0. 2) Did you make Skidracer's Vwait fix to the Dx module? You may have left it on and it affects flip 0 too.
I have never applied skidracers fix. 3) How about a key to change flip modes (F or something).
Good idea! 4) Is the antilag fix Indiepaths latest one?
As far as I know. 5) I see that it's not using Set Blend AlphaBlend...also are you using automidhandle, this antialiases stuff too.
I forgot to use setblend alphablend :) Will fix this stuff now.