I recently signed up as a premium member and found several comics imported into my library are missing thumbnails, which only appear after clicking on the empty space. Could it be I have too many comics in my collection? I have 30 comics currently in my collection. If this is a big could you please into it?
I don’t think the problem is because of the large library.
I think we have a bug somewhere releated with the thumbnails. We will investigate and hopefully fix it for the next release.
Same issue with missing thumbnails…
It happens more often when the comics have many pages.
Thank you so much 
We are aware of this glitch and we’ll be investigating it soon.
Despite the last update, I still have this problem. It happens mainly after reading and returning to the library.