Material Parameter Previews Broken in 5.7

All of my materials and their previews showed up just fine before opening 5.7

Now it’s just a bunch of black boxes. I have tried editing and resaving and reloading my blueprints. They are all broken and no longer show material or color previews.

Some of them randomly show basic colors. Most of them don’t even have a square. It’s just a blank preview where before it showed colors and material previews.

image

This issue is super annoying and I would like some support for it. Why are all the squares black instead of showing color and material previews? They were working properly in 5.6

My material previews are still broken!

Is there an update for this yet?