I encountered a similar problem on a PC I used to use. I don't have an elegant solution. I did norrow down the symptoms of the problem to be somehow related to the way Windows automatically creates thumbnails for certain video fromats. If possible, try changing the folder view so that thumbnails are not enabled. For example, "View->List".
I hope someone else can offer advice more specific to your problem.
Good luck,
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Alex - Founder of OCC
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