I was using my mouse for a while but then when I moved the cursor using the trackpad my mac was behaving very weird. I can't drag any icons. Things don't get highlighted when I move the cursor over using the trackpad (e.g. in mission control the programs should get a blue highlight, instead they don't and I can't click them, however when I move my mouse one pixel the highlight suddenly appears and I can click it again, no matter with which device) and when I try to move a program, the cursor will first move and then when I let go of the button the program will suddenly jump to that new location. Doing the same things with the usb mouse results in normal behavior. This was fixed when I restarted my Macbook but it came back again for some reason. Also when I do a secondary click, the menu immediately disappears. If I clicked on a word, the word stays highlighted. Anyone got some ideas on how to fix this?