So, I got reported a problem with my already released character set.

Here's the Superfly version of her skin shader (External outputs plugged to Cycles root, External inputs plugged to diffuse, bump and spec maps):

I've been testing her always with Branched Path Tracing off and Progressive Refinement on, as that works best for me and I thought the only difference in those were render times and quality in specific things. However, a customer of mine uses Branched Path Tracing on. Here's my trouble.

Branched Path Tracing off:

Branched Path Tracing on:

The only difference I could get was if I turn Volume Samples higher:

What gives? Is there anything I can tell my customer to do without me having to change her shaders (as this is an already released product)?

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.