I have to triple tap everything on Galaxy Tab 10.1 I don't know how the settings were changed; my young daughter may have done it. Also, I just got the new update this morning. I have to touch, then double tap every time. Also, there is a yellow line around the screen and everthimg. I've checked all settings I know of, but I can't reverse this.
Sheryl found the answer herself. Quoting her comment:


  I finally found it.. My daughter must have been in the accessibiltiy settings. She had the talk back on. But I didnt realize because she also had turn off all sounds on. I dont know how that makes the tapping weird, but is fixed now.


If one has a similar effect (e.g. red borders shown), and it's not the accessibility settings, another place to look for is the development settings, which also has switches to highlight certain areas for "developer feedback" when testing an app.