What do you see in a documents window from outside Photoshop?
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Hi Trevor, yes if I go to file manager and explore some folders with images/photoshop files I see a thumbnail preview so to me it means its something to do with the Photoshop CC program itself?
I can recommend trying out the FPV codec pack. http://www.fastpictureviewer.com/codecs/
It's a trial,but I get thumbs inside Photoshop CC under Windows 7 and for a $15 license it's a deal.
There are programming reasons as to why thumbnails won't register in newer versions of Photoshop,but I'll have to let an Adobe programmer explain that part.