I'm wondering if I got a defective IS or is it the iPhone 4? I installed my Invisible Shield over 1 week ago. I noticed that it's almost like it's not set all the way. I can still slide the shield around. It's almost like there is still the installation solution under the shield allowing it to move. I'm wondering if the shield just doesn't adhere very well to the glass. Anyone else notice this? EDIT: If you are having a problem with your IS, please note if it is the screen shield, rear shield, or both.