Editor crashes clearing existing world after "save current as..."
I've been using UE4 4.22 fine for the past month or so and recently upgraded my GPU from an AMD R9 390 to an Nvidia GTX 1070. Now, all of a sudden the editor crashes whenever I try to save current level as and name it something else. It'll save the level, but when it tries to clear existing level to load the newly saved/named level it then crashes. This happens every time I try to do this making it impossible for me to use this feature anymore. I've tried researching this and couldn't find an answer so I'll try here. Below is the crash log, and it's the exact same every single time. This occurs regardless of project, even in a completely new project with nothing in it.
Nothing else other than installing the 1070 has changed on my PC (exact same Windows 10 version, exact same UE4 version, etc.)
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