Odd drawing problem

Now, I am not sure of the source of this problem, but I though this question was best suited for this forum topic. I have a collection of solids, and each solid has a collection of faces, and each face contains 4 points. When I draw the points using the Polygon API, things work fine. But, for some reason, when I want to rotate one solid (say on the y-axis) and draw the points then, the result is a loss in face drawing. In other words, I lose some faces that should be drawn (even if they are not hidden by anything else). I verified the mathematics and the rotational matrix, and they are all good. So I suppose the logical conclusion is to blame the API function. What I beleive is that the order in which to feed the points into the Polygon API makes a difference, and when I rotate it somehow changes the proper order, and hence prevents proper completion of the polygon API. Am I right to blame the API? Is there another solution in drawing a face using the four corner coordinates??? Jonathan