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It happens sometimes... just force-close the apps (double clicking the home button, then tab and hold an app-icon until twiggling and then tap the red dot on all apps that appear in the dock), then reboot your iPad, holding on-/off switch and home button until (after switching off) the Apple Logo appears.
If even that doesn't help delete the app which causes you trouble from the iPad and re-install it.
And if even that does not do it - get rid of your iPad - you can then send it to my address