Hi, my name is XXX XXX I will be working with you today on your question!

I think you have the highlight alert system on as it is just alerting you to highlighted areas in your scene on the LCD correct?

Take a like here: http://www.dcresource.com/reviews/canon/eos_5d_mk2-review/using

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In the menu under the 4th tab (2nd blue playback tab), make sure that the Highlight alert (on/off) - shows clipped highlights is off that should turn off your flipping white areas that are showing extremely bright areas in your photos

Let me know if this solves your problem

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Thank you,
Dan