4K DCP MXF video don't show picture (Mac)

Hello,

4K DCP MXF (unencrypted!) video material does not produce an image, only black.

(It works fine with 2K materials and even with 4K ProRes materials.)

Premiere Pro -> latest version

Mac Studio:

Apple M2 Max - 32GB Ram, Sonoma 14.6.1

Mac:

Windows:

(It works perfectly on Windows with the same version.)

Any idea what might be disabled or not set??
Thanks!