I seem to be having some problems with my keyboard shortcuts. My Apple wireless keyboard has been working fine until today. It has just started stuttering when pressing space and backspace inconsistently. It also seems to double space sometimes. I also seem to have lost the ability to use the functions like switching apps "cmd + tab", "cmd + space" and even some of the shift functions. Copy and paste seem fine for the time. Consistently "cmd+ Q" works fine. I have tried deleting the Finder preferences .plist and repairing the disk permissions with no success. Randomly some of these functions will work but cannot seem to find a answer on a search for it. Some people are saying the "Dock" is freezing too (I am not having that problem). Anyone have any other suggestions or experience with this? I should mention I have replaced the batteries of the keyboard to try and fix the problem.