I went back to the MSFC images and checked again. The cloud pattern today is indeed quite thin compared to what it was on the 9th so a glint should be visible - but it only shows up in the Pacific. Under magnification the glint was visible at about 15N latitude from roughly 1945Z to 2145Z west of the Mexican west coast (at 2145Z it was at the edge of the image that I was using) - but nothing is seen in the Atlantic. I'm not into Optics so I'm not sure why. If a 'filter' was in use I would have thought that it would have been applied across the full image. It looks like you have presented quite a mystery.
ED