I often find in sudden melee one on ones that my melee trigger doesn't register. Usually when an enemy appears suddenly and you are already at melee distance, pressing the assigned button on my mouse has no effect. Leaving me to get melee'd in the face and then look at my mouse wondering what just happened - then on respawn I click the 'melee' button and it appears to be working just fine.

In the past I figured that maybe my mouse wasn't up to the job, or had a slightly unresponsive button but I just got a new gaming mouse yesterday and the issue remains. Does any one else have this issue?

are u using the right mouse drivers? whats your mouse?

had problems with my mouse in the beginning of bf3. Solved it making an AHK script where my mouse was triggering a keyboard button instead of assigning the mouse directly

I'm using a Logitech G700.

Originally the mouse button was assigned to the default [v] key. I figured it could be an issue with keyboard ghosting so I assigned the 'melee' to [Left Control] and then mapped that to the relevant button in the mouse software. Doesn't seem to make a difference. I checked with a ghosting tool online to see if there were a combination of keys that my system wouldn't accept and there doesn't appear to be.

I find myself in the "almost" same spot. Melee is just not working sometimes for me.
Do you know how many times I get meleed because MINE don't connect? True story.