ms_meme and everyone else: thanks much. I had the same problem and I was quite stumped.
I searched the forum for "mouse middle" and this thread popped right up.
Mouse problems cured!
Hi Andy Axnot. I am glad you got the middle mouse problem solved. It may surprise everyone...but I too searched before asking about it.
Since then I updated and had to delete the very same file again.
Then yesterday I did another update and found the middle mouse button would not work again.
You would think I could do it with ease and comfort....but no. I still get sweaty palms and palpitations when rooty things appear. One would think that whoever is running this show would just delete that file in the first place.
It is probably just a test to keep us on our toes.