I have experienced this only when the iPad is charging from the AC.
I swipe up with 4 fingers (or double-tap the Home button) to reveal the multitasking bar.
I should then be able to touch and hold any icon in the bar until the all flash, so I can delete them.
But when the iPad is plugged in to the AC, the contents of the multitasking bar wiggles - left to right -
So, as soon as I unplug the iPad, the actions return to normal.
Is this a bug that might get fixed in the next update?