Hi,
Is it possible that you accidentally changed the 'Home Screen' setting?
To make sure your Home screen is the home screen you want, hit the menu list button (first button on the left) (I'm still a newbie too!). Then tap on the 'Edit' button (on screen). You will get all your 7 Touchwiz or Shortcut pages. The will be a 'Remove' button on the bottom of the screen. At this point, tap on the 'Menu List' button (remember, the first button on the left). The 'Remove' button will now change to 'Set as Home'.
Now tap that button (Set as Home), it will change to 'Done' but your really not done yet. You need to tap on one of the miniaturized screens that you want to set at the Home Screen.
After you do that, you will see an icon of a house, now you can tap on the 'Done'!
You have now set your Home Screen Page!
Rob