Texture Heap Allocations cause editor freeze when opening the texture editor on Mac

Opening a texture into the texture editor cause the editor process to "beachball" or hang indefinitely.

Note:
I'm also seeing this in UE4/Main on this mac, it could be a local issue or an idiosyncrasy of this machine.

1. Open QAGame in the editor
2. Open a texture in the texture editor (I used Cavewall_Normal)

Result:
Observe the editor process hang indefinitely