Here's what you need to do to get it working.
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Start EzeScan
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Press F2 to start the Operator Actions form.
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Select the job you want to fix.
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On the scan tab, set Threshold to zero (0). This disables this setting.
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Set Brightness to 128 and Contrast to 128.
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On the enhancement tab, tick the Despeckle 1x1 option.
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Save those settings.
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Repeat steps 3-8 for as many job types that you have setup.
That should fix the problem and you should now be able to scan okay in black & white.