UE4 dx12 still crashes in editor

Upgraded from 14.6 to 15.8. Seems it's wringing the last bit of water out of the towel. A very nice improvement with zero upgrade or rollback problems. Most versions up to 14.x gave me a lot of trouble updating. 3DMark 11: 14.6 score: P6682 Graphics 6722 Physics 6874 Combined 6154 15.8 score: P6834 Graphics 6776 Physics 7467 Combined 6434