Chaos Corona for Cinema 4D > [C4D] Bug Reporting

Interactive or Render with VFB opened on 9950x freeze system

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MircoTosti Studio:
Hi guys,

after several tests I found that both in C4D ver. 2024 and 2025, when rendering scenes with VFB open instead of PICTURE VIEWER this causes a system freeze or a slow motion style slowdown of both the mouse and the entire system. Instead if the VFB is closed and you let the scene go to PICTURE VIEWER this does not happen.

Workstation with win11, X870e Aorus Master, Ryzen 9950x, 192GB ddr5 5200.
Ver. Corona 13 latest (Daily Build Aug 28 2024 from Chaos Corona About window).

Any possible solution?

Nejc Kilar:
Howdy! Thank you for opening up a thread :) Does this apply to Interactive rendering or final render or both maybe?

MircoTosti Studio:
Hi Nejc,

permanent system freeze often happens to me with interactive, while the system freezes partially/temporarily when I render the final part. Also, in the final render I noticed that if I don't open the VFB window, this temporary freeze happens less often than when I have the VFB window open.
Processor works consistently well at 100% when I render without sudden drops or gaps.. and the ram never reaches full usage with 192GB.

Any ideas?

Nejc Kilar:
Hm hm, the devs are working on fixing some of the threading issues with high core count CPUs and I'm wondering if that'll resolve some of the issues you're having. I'll update this topic once the build is ready.

bnji:
Hi there, thank you for bringing this to our attention.
Yeah, I'm wondering if it's a HW-related issue. (as it looks like)
We'll need to wait until the dev team releases the fixes mentioned by @Nejc
Sorry for the inconvenience.

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