switching between debug and release version is kinda annoyin

well, do get your project to work, you need to add a reference to the Math3D and OgreDotNet dlls. if your in debug mode, you need to add the debug version of the dlls. but if you want to compile in release mode, the compiler will give you errors because you need to remove those references, and add the release version of those dlls as references. and when you switch back, you have to do it again, etc...

is there a solution to remedy this kind of annoying step?

try Insted of referening the dll, reference the project. That means you will have to add the .Net projects to your project solution.