When I was editing a model in solid mode, the properties window refused to adjust correctly; every time I pulled it closer to the edge of the blender window it would take up more space, the opposite of what it had done before.
While I was trying to adjust the size of the properties window, an unresponsive black screen appeared. The screen took up more than half of the window.No matter how many times I close and reopen the model I was working on when the error occurred, the screen remains unresponsive. Before closing the file for the first time after the black screen opened, I saved my progress.
The screen seems to show the image of the last blender file loaded after opening that particular blender window.
All other blender files work just fine; this is the only one that has this issue.