Hi, I''m about to turn crazy! I have this SIMPLE shader (code will follow), I compile it with D3DXAssembleShaderFromFile then I take the declarator and the compiled code and I store it in a new file the, in my engine, I load this file, extract the declarator, the complied code and pass it to CreateVertexShader. That was working perfecly for all my shaders, but now, I got this stupid shader that is not working for no apparent reason... Here is the code : vs.1.1 // world position mul r0, v0.x, c0 mad r0, v0.y, c1, r0 mad r0, v0.z, c2, r0 mad r0, v0.w, c3, r0 // world normal mul r1.xyz, v2.x, c0.xyz // *** mad r1.xyz, v2.y, c1.xyz, r1.xyz // *** mad r1.xyz, v2.z, c2.xyz, r1.xyz // *** // projected position mul r1, r0.x, c9 mad r1, r0.y, c10, r1 mad r1, r0.z, c11, r1 mad oPos, r0.w, c12, r1 Here are some precisions : - D3DXAssembleShaderFromFile GIVE ME NO ERRORS - CreateVertexShader is crashing telling me that I''m using vertex shader version 48.46 where max is 1.1 (!?! wtf !?!) - You noticed that the line marked with *** are useless but I will need them later, I compiled the shader without thoses lines and CreateVertexShader did not crashed (darn!) - I really am pissed, all my other shaders that are about 100x more complicated are working, and this simple one is not! - A friend of mine already had same kind of weird bug with assemblesahderfromfile (he was never able to fix it and commited suicide) did you? PLEASE HELP! It''s 3:30 in the morning and I wont find sleep until its fixed!