Video corruption in FCPX, fine on real iMac

Video corruption in FCPX, fine on real iMac

I'm starting to have a really bad video corruption in FCPX (10.5.1 on Big Sur 10.2.1). The same library is completely fine on my real 2015 5k iMac. This is the first time I'm seeing this in a yer of using this Hack. Cleaning the library cache (or deleting it completely), resetting FCPX prefs and rebooting didn't help. Everything else SEEMS to be okay, including displays (4k and 1440p via DP1.4).

Any ideas?

Config:

CPU: i9 10850k

Mobo: Asus Prime Z490-P

RAM: 64 GB (4x 16) HyperX Fury 3200 MHz

GPU: Sapphire Nitro+ RX 580 8 GB

Bootloader: OpenCore 0.6.6

iGPU: enabled

OS: Big Sur 11.2.1

Kexts: just Whatevergreen (coming with OC 0.6.6), no special boot args

https://preview.redd.it/odv7vnj1c0i61.jpg?width=972&format=pjpg&auto=webp&s=62100168dc8b7a4ed24b3e0982d9e6b2c171b94e

submitted by /u/Stooovie
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