Desktop background turns to white

Hi, this just started today. During startup, the selected desktop background picture flashes. When all applications that are set to open at startup have loaded and all disks have loaded, the desktop background turns all white, except the menu bar which still displays the selected desktop background. I have tried restarting several times, I have tried using different background pictures, all the same result, my desktop is all white which makes it hard to discern various open windows since most window backgrounds are white too. Please help.
Thank you.

I am having the same problem, have you had any luck fixing it?

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