When I turn the soft particles on I have some strange effect on the side screens with tripples. It was allready in the last build present if I recall correctly. Happens also without rain or multiview on with any car track combo.
Bump* Still present. I switched meanwhile form AMD to Nvidia so doubt it has something to do with the drivers or cards. With the only difference that the purple areas are now greyish. So multiview and all settings on max doesn't work with soft particles. It does only on lowest setting which is off I believe. Performace drop is insane aswell, goes down from 80 FPS to 30 FPS.
I'm getting this with MultiView and Soft Particles also, but only when set to maxiumum quality setting (Soft Particles, that is).