Safari problem

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_5 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8L1 Safari/6533.18.5)

I'm new to the iPad, just got an ipad2. I have 9 pages open on safari, and can't get to close any of them or open a new one. When I tap the button on top which shows the number of pages open and is supposed to open the thumbnail view of all open pages, nothing happens. Have I done something wrong?

 

Forgot the old apple maxim: when in doubt, reboot. . All is well.