I'm using Unity 5.2.2. While previewing a game inside the Editor, the mouse pointer disappears. So there's no way to change values in the Inspector or elsewhere in the Editor. Is this a known issue with 5.2.2?
Other users have reported similar behaviour. I believe you can still "click out" to free up the mouse pointer, but I can't speak for Unity, and it's not an AC-related issue.
Let's hope they fix it soon - it's REALLY annoying! I have the same problem, but only some of the time - haven't investigated enough to find a pattern, though.
Update: I noticed that unchecking "Replace Mouse Cursor" option in the Cursor manager fixes the issue. That should be good enough for the development stage.
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http://answers.unity3d.com/questions/1096005/cursor-missing-in-unity-5-editor.html