Adobe Library - Logo uploads, thumbnails covert black

Hi Everyone, 
Finally getting around to getting to the bottom of this. I typically create event brand libaries for use by various designers. I usualy have all my logos in one AI file, then save them as separate AI files once I'm ready to upload to a library. For upload to a libary, I open the CC app and add the AI files by dragging and dropping into the appropriate folder. Here is the issue, when I do this some of the logo thumbnails are full color, but some convert to black. The logo file themselves are still full color because when in AI, I drag in one of the logos in questions and the placed logo is full color. So, the issue is just the thumbnails in the CC library and app libarary panels. Anyone have any ideas? Maybe it's something to do with the art and how it's set up? Transparency? Spot Colors? 

Thank you in advance,
Jason