OpenGL texture randomly not shown

I have got a very, very strange problem in my C++ OpenGL application. I simply load a texture and apply it to a quadric: ``` glGenTextures(1, &tex); glBindTexture(GL_TEXTURE_2D, tex); glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); ``` Then ``` glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, tex); gluQuadricDrawStyle(quad,GLU_FILL); gluQuadricTexture(quad,GL_TRUE); gluCylinder(quad,1,0,2,20,1); glDisable(GL_TEXTURE_2D); ``` Now: it works perfectly 9 times out of ten, but sometimes the texture isn't shown (the quadric stays white). The `image` is correctly loaded, so the problem should be with OpenGL. I have tried with several different images too. Always `GL_NO_ERROR`. Any idea ? It is driving me crazy...