Same OS, on Mac Mini M2, Poser freshly updated, I've loaded many characters, props and scenes that were in the Included part: no crash. Safari was even streaming a youtube video at the same time.

Have you any AV that could disturbs Poser while loading anything?

𝒫𝒽𝓎𝓁

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👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sonoma 14.6.1, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️