White backgrounds in libraries

[alisonp1120]

We have been uploading a lot of vector illustration assets into the cc library. Recently we've discovered that random white backgrounds have been generated in the preview thumbnails of our assets. And according to my colleagues, some of them can see them while some of them don't. The white backgrounds have greatly affect the preview of some of our white coloured illustrations. 

[Zhenyi5C84]

Same problem here, any solutions?

[toadlyrad]

I also have this issue almost 1 year later. 

[Maggie D.]

Same problem. So frustrating!