This is genius, and solved my problem. I had a Quixel material I added to the project early on, then later enabled virtual textures. I recently started experiencing lots of crashes whenever the shaders compiled… and lo and behold, this was the cause. UE didn’t like that I accidentally mixed virtual and non-virtual textures.
Ultimately, I had to edit the master material, convert the default textures to virtual textures, and then change the samples to Virtual …
Bam, textures work and no more crashes. Thank you!