I am probably just a noob still when it comes to C#, but I wanna record this problem/solution so its no longer a problem in the future.

Apparently C# is very picky how you handle arrays of custom classes your write in Unity3d. At least the declaration is picky.

Here is the solution:

public class someCSharpScript: MonoBehaviour {

private myClassArray[] myCustomClass;

void Start() {
myClassArray = new myCustomClass[10];

for(int i = 0; i