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glUseProgram fails...

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Hey guys, I put shaders into my engine but they won't work. They compile and link correctly, and if I call glIsProgram() right after creating the program, all is well. But when I call glUseProgram() to apply the shader, it doesn't work. I called glIsProgram() right before glUseProgram() and it returned false. I also checked for gl and glut errors using glGetError() and it returns that there are no errors. If anyone has an idea why my program gets created correctly, but then decides it's not a program later on, I would greatly appreciate a response. DigiNerd

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