Title says it all. A few PNG images will show up, but most are just icons. Open them in PS and they're fine. Look in a file explorer window, and fine.
Cache cleared, prefs reset, etc. etc.
Try opening them in AI or PS and resaving them.
Then try clearing cache for each image
3 years later now and I'm having exactly the same problem with the latest Bridge. PNG generated at Imagine.art don't show previews in Bridge but they do in explorer and opening fine in photoshop. Any solutions? Opening and resaving is not an option...