Stability Issues with Corona 13 and Corona Hotfix 1

[pictura]

Hello,

I am experiencing stability issues with Corona 13 and Corona 13 Hotfix 1.

Since installing Corona 13, I have noticed that while rendering works fine most of the time, Corona occasionally freezes when a pop-up window appears — typically during denoising or when saving an image.

I initially suspected that the issue might be caused by too many background programs or outdated GPU drivers. To address this, I uninstalled unnecessary background applications and updated my GPU drivers (NVIDIA GeForce RTX 3060 Ti). Unfortunately, the problem persists.

I have never experienced this issue with previous versions of Corona.

The problem is urgent because even though renderer is finishing denoising I can't save it. Only way is killing all the process and restarting Cinema. All rendering time is wasted and no certainty next time it let me save.

My setup:

Cinema 4D R21

Windows 11

AMD Ryzen Threadripper 3970X

Could you please advise on how to resolve this issue?

Thank you in advance for your help.

Best regards,

[TomG]

Sorry to hear about the problem. Some extra info would be very useful, or even critical, to diagnose what is happening - Which denoiser are you using? Does this only happen with a lot of passes (this can raise ram/vram requirements if each pass is being denoised)? Since it is a freeze, can you submit a minidump, see the second section of https://support.chaos.com/hc/en-us/articles/4648898278545-How-to-report-issues-C4D on how to do this during a freeze. Is it definitely frozen and not just taking a very long time?

[pictura]

Hi,

Thanks for your reply.
I’m using the High Quality CPU denoiser.

It doesn’t look like the denoising process itself is taking too long – because even when the progress bar is stuck at 0%, the Corona Frame Buffer shows that denoising has already completed.

The same issue happens when saving some JPGs: the small “saving” window freezes at 0% and blocks the whole program.

This makes me think it’s more of a GUI issue rather than a problem with the actual Corona function. There is also no "not responding" in cinema proces in the task manager
Interestingly, I can’t reproduce this behavior on my other PCs.