After updating to a more recent version of Unity, I found that, when I tried to drag components in the inspector, the window would no longer scroll vertically when my mouse reaches the top or bottom of the screen. This makes filling in certain variables in my larger classes impossible and is incredibly annoying! Am I missing something, here?
I also noticed the same thing.
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You probably found a regression.
Please submit a bug-report
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So, I’ve noticed. In the meantime, you must find a blue insertion area in order to add components to a game object in the Inspector. Not much practical but it’s still something. 
You can also collapse existing components to make room.
Well, the thing is, you can’t scroll while dragging anything. Not even references from the hierarchy which you want to put into fields that have shifted out of view. And I have seen a lot more components shifting around when you start Play mode, which I didn’t think would happen, so this situation occurs more than you might think.
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I’m aware of changing the order of components, the issue is in, say, large classes with many variables (like managers, or complex player characters), where vertical scrolling is required to fill variables when your screen isn’t high enough res to show the entire class at once.
I will take Peter’s advice and report a regression