You guys are missing the obvious. Look at the HDEV camera from today. Compare it to the HDEV video from the article.
[link to drive.google.com (secure)]
Notice anything glaringly different, other than the lighting angle? How about the fact that a Cygnus capsule is docked in the current image and isn't in the article? That was docked to the station back in mid November.
[link to blogs.nasa.gov (secure)]
This video is old, lord only knows from when exactly but it's weeks old. Incidentally, looking back a couple weeks before Cygnus arrived on the station, there was blue glare visible at that point in the camera when the sun angle was right for it (41 minutes into the recording):
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[link to www.ustream.tv]
Of course, it doesn't look nearly so mysterious when it's not filmed off a screen by a potato camera. And note, this isn't even the same video used in that article, it's a totally different orbit probably on a different day around the same time period give or take a couple weeks. It just appears any time that camera is on and the sun angle is right to produce that glare.

*Here's another example of it, from a totally different day and different orbit, same blue glare, right around orbital sunset same as before:
[link to drive.google.com (secure)]
[link to www.ustream.tv]