Black thumbnails in CC Libraries

[granth54436419]

Hello all… we are working in a mixed Mac/Win10 environment, using the latest production releases of AfterEffects and Premiere Pro. Our primary graphic artist has created a set of animated glyphs (in .mov format) for video creators to use, and put them into a CC Library.
Our problem is with the library thumbnails. While the transparent background is shown correctly on Macs, it is a dark charcoal in Windows. For black graphics, this makes them effectively invisible. (see image below).  
The graphic appears correctly once it is placed on a layer in AE or PP. How do we get the Library thumbnails to display correctly in Windows?

[Tarun Saini]

Hi there,

We're sorry to hear about your difficulties. Could you please tell us where are you checking this thumbnail, are you checking this on the Creative Cloud Desktop application, the Creative Cloud website or any other Applications like Photoshop, Bridge etc? Since when have you been seeing this issue? We're here to help, just need some info.

Regards,

Tarun

[granth54436419]

I am seeing this in AfterEffects, Premiere Pro, Photoshop, and the Creative Cloud Desktop.

I've been seeing this since last week, which was the first time we had rolled this out.
We do not use Bridge.