Thanks for the info and ideas.
I'm in Win 7 x64, w/16.0.110.
The maximize occurs on mouse-down, immediately when selected.
It might be a bug.... I can't reproduce it. I've just spent the last few minutes double-clicking and single clicking on the title bar of MC with reckless abandon and it still seems to work right.
I really like my Razer mouse I have at home. It can be a bit fiddly though... The precision is nice sometimes, but for everyday use I had to go into the settings and turn it way down, or it was unusable except for in FPS games.
I do have an older Razer mouse that fell victim to the flaky left mouse button problem, though. They're not impervious just because they're expensive. The switches in those things are just built out of plastic. I think I must have strong fingers or something (I also drag and hold things a LOT, especially in Final Cut) because I break the left and right click buttons on mice ALL THE TIME.
I rarely have one hold up for more than a year or so. The Razer (a Mamba, FYI) luckily died during its warranty, so I got a new one for free.