For me it didnot crash in either with or without .

Can you try a new character from CC4 ?

I'm not interested in Hardware rendering since long time ago, on comparation I liked more IC's software rendering.
For MP4s, since I'm using them for fast previews, I'm rendering in 2K @ 30fps, the final rendering I'm doing in 4K PNG sequence.

______________________________________________________________________________
Software developer. iClone hobbyist since January 11, 2020. Best work so far: Robots among us: The Lab and The sad end of a legend
In progress: Black Mamba
AMD Ryzen 3950X 16C/32T 4.2 GHz, 64GB RAM, RTX2080 11GB, 2TB Samsung 970 Pro SSD, 8TB Seagate BarraCuda HDD, Win11 64-bit, iClone 8.12

Can you try a smaller project ?
Also you can turn on hardware rendering.
I am so busy , didn't get to try but rendered once without issues in MP4

I used cc4 to make a 4 k avatar and sent it to Iclone 8 and rendered a high resolution MP4 video.

I just installed IC8 in a total separate folder structure than IC7, loaded my current IC7 project (15000 frames), everything went pretty smooth, I started rendering as MP4, I cancelled, but when I chose "Save" the IC crashed. Tried the same three times in a row, three crashes in a row. IC7 is having no problem. Pretty exciting start for the money :D

P.S "Optimize with Fullscreen rendering" has gone in IC8?!?

______________________________________________________________________________
Software developer. iClone hobbyist since January 11, 2020. Best work so far: Robots among us: The Lab and The sad end of a legend
In progress: Black Mamba
AMD Ryzen 3950X 16C/32T 4.2 GHz, 64GB RAM, RTX2080 11GB, 2TB Samsung 970 Pro SSD, 8TB Seagate BarraCuda HDD, Win11 64-bit, iClone 8.12