I have this same issue - the solution is to hit alt+enter when you encounter this black screen on startup. For some reason it appears with two monitors (at least in my situation) I cannot see the first screen when in full screen mode and only encounter the black screen you describe. Alt+enter switches between full screen mode and windowed mode. For me the reason it only happens sometimes like you described is because I sometimes log out in either mode. I have found no other solution but it is a simple fix, I hope this is a solution for you too. Happy hunting.
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