Tonact

I guess you have assigned your "M4 mouse button" to "alt button" so when you press them at the same time = "alt+tab" which is a hotkey for program toggle in many win os, win7 in your case the solution is, i guess, change the hot key of your push to talk to something else maybe ctrl or so i hope these help

I found seperate pieces of "map of N Chernarus" and "map of S Chernarus". Each of them can be zoom in very close but when I combined both of them into a "Full map of Chernarus", it can't be zoom in as close as when seperated. Is this normal or bug? here is a picture to explain..

How about add 30-60 seconds countdown after the request of log out? This could prevent the issue You've got honesty, should be proud on that