Flashing in low sample pre vis in C4D

[thekid87]

Since I updated to 2.25.3 I have a flashy render at low samples. I have updated both the C4D and Standalone as advised. My GPU drivers are up to date. Material PNG sequences are flashing too. It seems like Octane is rendering in a different way now. Not sure how to explain it. It flashes black at first then starts to render but almost seems to repeat the process halfway through the sample count. One of my favorite things about Octane is the ability to render non flashy low sample pre vis for clients. It was grainy but never flashing like old C4D GI renders. Not sure what is going on. I reverted back to 2.24.2 and it's the same. GPU issue?
Dual 780ti's, 1 770 GTX. Latest drivers installed.

[aoktar]

Any sample to show what you mean? Latest version is best of all older versions.

[thekid87]

Sample2.mp4

Really Low res 150 Sam.

(5.66 MiB) Downloaded 2001 times

Here is a really low sample count. Again, I expect the grain, it's the flashing and png issues that have me stumped. The flow from the machine on the right is a looping png sequence. Same one in Diff channel and Opacity

[thekid87]

sample.mp4

(4.75 MiB) Downloaded 2001 times

Higher Sample count. Not as much flashing but still there.

[aoktar]

Disable and try with coherent ratio=0. It causes flashes on low samples.
Also no need to use diffuse for previews. AO will help much on low samples as 32-64.

[thekid87]

Sample3.mp4

(5.84 MiB) Downloaded 2000 times

Older render on 2.24.? Base settings, still grainy but no flashing. Png sequence is handled perfectly beside the bad loop job. I know I can up the depth but it wasn't necessary before and it kills the render times.

[thekid87]

Thanks. I just noticed on the Old version the coherent ratio. I'll try that. Thanks for the quick responses! You're the best. Keep up the great work!

[aoktar]

Thanks. I just noticed on the Old version the coherent ratio. I'll try that. Thanks for the quick responses! You're the best. Keep up the great work!

Thanks. Btw i'm not writing the renderer, just plugin.

[thekid87]

I know but I think most would agree, you've done an amazing job. Thanks again.