Is C# part of the problem?

[Codex]

Memory leaks can occur in any language, no matter if a garbage collector is present or not. It's comes down to following good coding practices, it's especially important when making interop calls.

For me I have no doubt that CloD is written in C# due to early error messages people were posting after release. Also the only official Microsoft "Direct X" API that operates on .NET is XNA, however this is capped at DX9 so you can safely say that they CloD is making calls to the un-managed version of Direct X which is the current main stream API of choice.

Maz is right, interop calls are taxing and I wouldn't be surprised it that has been the main cause of all the issues because I get the "feeling" that this style of programming for a game is still in it's pioneering days.