Added:
Update to Iray SDK 1.6

Fixed:
[Shader] Crash with old faulty shader
[Material Layering] Materials can disappear when reopening a project

Known Issues:
HDR color space conversions with ACE on Linux produce clamped colors
[Layer Stack] Input source not saved per layer
[Crash] Ctrl Z After deleting a shader instance
[Iray] IoR is blocked to 1 for some shaderss