I have a Pro account with mmm very large number of images. And this had become a problem. Backend simply would not load the images unless i cleared the cache and reloaded the page multiple times. I was in fact considering switching to a brand new account to resolve this problem at my end.
But in the last 2-3 days I have seen that this problem has largely disappeared. Images load fine after a slight delay. Funny enough, this behavior started when I renewed my Pro account.
Just wanted to see if you had changed something in the code that was used to fetch the existing images for display in the backend!
Customer support service by UserEcho