What can be done about the configuration cfg?
As explained in many other thread, you can resetting it, by removing the FSX.CFG file, forcing FSX to rebuild a new one with default settings.
I do not believe in an issue of the video card.
I haven't said it is SURELY an issue of the video card. I've said it can be EITHER
1) a problem of the video card settings
OR
2) a problem with the FSX.CFG setting
OR
3) a problem of you looking from too far way or with a too wide zoom setting
Especially since it seems to be a problem in the animation of the car
The only thing sure, it's NOT a problem with the animation.
because the cars have already been solved transparent.
I don't understand what you are saying here: we surely haven't "solved" anything, the transparent cars were due to one of the above 3 items, if it was solved on your system, surely we haven't don anything to fix it so, it must be you changed some settings without realizing it.