The first time after Poser installs, or after you update some specific drivers on your computer, Poser needs to rebuild render kernels. This can take some minutes to do, and then it won't do that again unless something (installation/drivers) changes.

If you're rendering directly, Poser will say it's building render kernels in the progress bar of the render, but if you're rendering on background, nothing will warn you of this, it'll just build the kernels, and it might feel frozen or crash if you interrupt it. Could this be what's going on?

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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.