FliFi not working nicely with CGX - interleaving problem

[Flashlab]

Finetuning my config here since my latest purchase. I was planning to go completely to CGX and use my PicassoIV as a flicker fixer.
I installed CGX4 with drivers for Voodoo3 and PIV; they both work in RTG. When I try a WHDLoad game I get interleaved moving objects though. This never happened in P96. I tried without any driver in Monitors (no CGX driver should be loaded then?) and then the problem goes away. So I guess the PicassoIV driver does something to the FliFi settings. Version of the driver is 4.4.

Does anyone have a fix for this problem? Could I use the PIV as a FliFi without using its driver but with the Voodoo active? I would only need a monitor switcher then? Or would it be easier to get a cheap TV card and connect the Voodoo to that?

I may want to use the PIV too for RTG as I have this weird problem that the Voodoo produces yellow borders around ShapeShifter screens; doesn't happen with other apps.

Long post; as you can see still some finetuning needed!

[Flashlab]

@Lemmink

I do have the G-Rex and CS-PPC combo. I haven't found the software scandoubler option yet though; will look into it.

It seems though that the CGX PIV driver does influence the FliFi behaviour. If I boot without the PIV driver the FliFi works like it should work...

[Flashlab]

Isn't that just for the menu itself?

[Flashlab]

I tested with both options for 31khz but it makes no difference. The only difference is whether I have the PIV driver in Monitors or not.