On PC1 the RakGS.dll is loaded with client.c and server.c, but on PC2 it isn't loaded at all. The server crashed when I tried to start it on PC2. Sorry I was trying on the other computer and edit my post few times. Are there any other dependencies beside DirectX 9.0c?

So to sum up:

PC1 running server (ok) -- RakGS.dll loaded on PC1 --
PC1 running only client (ok) -- RakGS.dll loaded on PC1 --
PC1 connecting client -> server on PC1 (ok) -- RakGS.dll loaded on PC1 --

PC2 running server (crash) -- RakGS.dll not loaded on PC2 --
PC2 running only client (ok) -- RakGS.dll not loaded on PC2 --
PC2 connecting client -> server on PC1 (crash) -- RakGS.dll not loaded on PC2 --

When Bloodline did his first Raknet plugin I had this problem too with the DLL. Have not figured out what was the cause at that time, because he was going to trash it and move to version 3.0 of the Raknet plugin. I'll give your suggestion a try now and see if that works.