I have 8 installed on two systems. On one, the start preview doesn't show when the mouse is moved to the lower left corner nor does the bar showing open apps appear. On the other, the Charms bar will appear when mouse activated but not by swiping on the touch screen (all other touch works) Is there a place where these functions are turned on/off?

Edit - Found the problem with #2. I have a Veiwsonic TD222 screen. The bezel makes it difficult to get far enough to the right to initiate the swipe. Need to start with the fingernail to get close enough.