Right then, this is just annoying. I have two dll's: Renderer - contains OGL / D3D rendering functions Game - plugin dll, contains game files Now Renderer.dll is loosely based off of the example in the article "Striving for Graphics API Independance(Independence)", so you can look at that to get an idea of what the renderer looks like. Now Game.dll is just a normal dll, however, here is where the problem is: everytime Game.dll makes a call to a function in Renderer.dll, there is an Illegal Error, stuff catastrophically fails and it's not pretty. Any ideas what I might be doing wrong? Thanks, -Jesse Edited by - Aphelion on February 24, 2002 2:19:32 PM

Make sure all your headers are up to date. What I mean is, if you have one project folder for the engine and one for the game (which uses the engine lib file and the dlls), make sure the headers you use to build the game with are exactly the same as the ones you built the engine, and the dlls with.

I hope that made some sense