Arrow trapped in second monitor

I am trying to learn Lion with 2 monitors -- Suddenly my arrow is trapped in the second one.  Help.

Try this:
  Apple Menu --> System Preferences --> Displays --> Arrangement
The rectangular boxes you see represent the logical alignment of the two displays with respect to each other. You can use your mouse to drag either to change the alignment.  There's a lot of flexibility here, but to my mind, not all arrangements make sense.  It's normal for both displays to momentarily blink out after you make any change.
You can't move your mouse off one screen and on to the other unless there is a place to go.  Here's an extreme example: Try aligning the displays so that the lower left corner  of the external display is touching the uper right corner of the iMac display. Now you'll see that there is a very restricted set of motions that will get the mouse from one display to the other.
My external display is the smaller.  I routinely align the displays such that the top edges are in a line, with the external monitor to the right.  Now all mouse motion from the external  display to the left succeeds.  Only mouse travel from the lower portion of the iMac display to the right gets "trapped".
HTH
Message was edited by: Hen3ry to remove leftover text in original message

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