When ever I try to place a Trap mine down it would most of the time take my weapons away and won't even place the mine down.
Hey! A friend of mine had that problem too, and I saw DB replied him that switching to 3rd person solves the problem. He did advise clearing the browser cache, too.
Okay. I also switch quite a lot with the view and nothing seemed to work for me but I have cleared the browser cache and now works much better.