So I was clicking around on abc.com and all of the sudden a white pop-up came onto my screen. It is for all intensive purposes, a large rectangular white square. This square persists on every webpage, horizontally or vertically, and is even present when I'm viewing and scrolling through my open pages. The block in question blocks the "X" portion of each page such that I am no longer able to close any page. I went into settings and cleared all of my data to little avail, what the heck am I supposed to do? My ipod touch is not jailbroken.