This is driving me crazy!
I'm running CentOS 6.4 on VirtualBox 4.2.12...
everything was running fine, I installed Guest additions and everything..upgraded the system (yum update..).etc
everything is smooth
but then all of a sudden, when I'm logged in, I can't type properly, I need to keep the key pressed to type like if I want to type "ls" I need to keep the "l" pressed for 2 seconds then I need to keep the "s" pressed.
This is strange because when I'm trying to login and type the password, it's working fine, but the moment I'm trying to type anything in the terminal it behaves like this!
ِAlso, if I go to single user mod or to text mode, I can type properly, so the problem is with GNOME session once I'm logged in
I have other VMs running (Solaris, RHEL6, ...etc), and this is the only machine that's giving me this problem.
Any clues?

This is driving me insane, I searched everywhere for a solution