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This question concerns a Mac Pro running 10.6 with 2 monitors set side-by-side and configured as one big monitor. Recently I have found that sometimes a "dead spot" appears to my USB Apple mouse in the lower right quadrant of my left monitor. When my cursor was in this area, nothing was clickable (making a window active, scroll bars, buttons, etc.) on that part of the window. Other parts of that window that were out of the dead zone were clickable. I noticed that some of my Safari windows straddled the junction of the two monitors, so when I dragged those windows to be totally in the left monitor, the problem seems to have gone away. Any ideas as to what might be going on? I have had this hardware configuration for several years but this problem is very recent. Thanks.

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Are they running at the same resolution? Also, try and adjust the layout in Display Preferences by dragging the two screen representations apart and snapping them back together. –  Ingmar Hupp Sep 12 '11 at 18:28
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Could you provide a screenshot of your System Preferences -> Displays -> Orientation Tab? –  Jason Salaz Sep 12 '11 at 19:34
    
What do you mean by "one big monitor" are you using a third party device or card to power your monitors? Does your menu bar extend across both monitors or live on one or the other? –  Samuel Mikel Bowles Sep 12 '11 at 23:21
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Check the layout of your displays in the "Displays" preference pane:

Screenshot

Normally it's not possible to position your displays such that there is an actual gap between them (at least on Lion), but perhaps moving them around will fix the problem.

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