Question about "Winter Tree" and flickering of its branches!

Hello!

I installed 3dsMax2011+Vue 8.5 xStream.
I made a scene with strata terrain with a car that moving along this terrain.
The problem is that:

-I made a first version of this animation as .tif images, with default settings in Vue xStream-Plugin.
The settings for AA in 3dsMax 2011-MentalRay, are Min: 1/64, Max: 4.
Precisely I set Automatic in VuePlugin>Options>RenderQuality: Automatic (based on native renderer sampling quality).

-Now I made a second version with Options>UserSettings>AntialiasingOptions:Texturefiltering=33%.
This due to the flickering of bushes, that appear in the first version of the movie.

Now, the flickering over bushes it is corrected; bushes appear smoothed.

-But the problem is that at certaint intervals the branches of "WinterTree" specie, appears and disappears, with TextureFiltering=33% enabled!
In the first version of the rendered movie WinterTrees were perfect.
Why?

Horsepower0171.