GrabImage unreliable unless flip is called twice

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I'm confused as to why you can't test this in OGL too. Does the pc that this fails on not run OGL? The code here runs perfectly fine on my pc, so I'm gonna need to test it on a few more. If anyone else can test this code as well that would be appreciated. And lets start getting some specs of pc's it works on and ones it fails on. Would really like to get this sorted before I find out my project is gonna start failing randomly. That'd be customer support hell.