You may need to play with the placement of the recievers to avoid problems. I was using a Logitech Cordless Elite Duo and got a MX700 mouse, the MX700 will not work on the Elite Duo reciever, so I had to use both. Everything was fine until I replaced the batteries in the keyboard, my MX700 started acting really strange at times, finally realized it started happening when I replaced the batteries in the keyboard. I moved the reciever for the MX700 a few inches and the problem went away...
I finally dumped that POS Logitech keyboard anyway, never did like that thing...
