Tearing on dual-monitor display

I have written a code in MATLAB to present 2 drifting gratings in a dual-monitor setup, one gratings in the middle of each monitor. I have setup my desktop wioth eyefinity enabled such thatboth monitors are grouped as a single desktop. However, I am always getting tearing in only one of the monitors (the monitor displaying the left side of my desktop) when I run this program. The MATLAB code works fine when I run it on a single monitor, so it's nothing wrong with the code.

Any help is appreciated.


My specs are:
ATI HD 6850 1GB
Intel i7
Windows 7 64-bit

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