I searched and couldn't find another reference to this, but sorry for the dup just in case.

When I drag my mouse to the top left corner of the screen w/ a maximized window and double click, the window un-maximizes instead of closing. To close the window requires me to aim about 5 pixels to the right of top left.

Definitely seems like a regression, and I'm guessing it's probably already fixed in later versions. Feel free to offer your opinion as to whether this bug was worth filing.