Hi. Maybe i´ve found an interresting effect. Don´t know, if the code-wizzard are aware of it. If not, maybe you want to check it out, else ignore my post.
The white square bug in D3D mainly occur when an ani is played facing a light source (e.g. a sun). I´ve tested it severel times. Maybe it´s just something, which happens on my machine. To test it, start any mission and face a sun, so it is in the middle of the screen. Then fire your weapon several times. After a few seconds, the squares occur. They disappear, when you´re turning away from the light-source and keep firing.
Hopefully i´ve made myself understandeble.