These are both two huge bugs for me.
Using the current set of MediaVPs, I can't play missions that have asteroids. I don't know what the exact problem is, but gimmicking around with the graphical settings gives me minimal improvement. I have to remove the VP entirely in order to play any mission that has combat taking place with an asteroid field in view. Even the asteroid field in the distance in Derelict gives me trouble.
Warnings cause a lot of issues in debug builds. I'm sure I've spent a lot of time clicking through them and most of the time it's related to missing media, null MOI, or (the one I see every single time), too many beam sections.
It's been this way for months, and most of the warnings should be minor fixes. As I said, I don't know what's causing the asteroid problem, but that's pretty critical since it's the only issue that keeps me from playing them in all missions (And the asteroids aren't a part of MV_AdvancedEffects, so I'd have to get rid of other enhancements too in the process of disabling them. Granted, I could pull them out from the VP myself, but that's too technical for most users.)
System specs:
AMD Athlon 64 3000+
1 GB DDR400 RAM
GeForce 7600GT
7200 RPM SATA HDD.
Usual settings:
All the graphical enhancements w/ shaders, no AA 16x AF.