major problem with CUDA and Nests

[Jim Curtis]

I created a sequence of TEN Nested Sequences.  Each Nest has DNxHR 444 2K transcodes from Canon RAW 4K on V1, with several ProRes 4444+ alpha supers on V2.  I also rendered some Cineform with alpha, and that didn't help.

There are 10 Nested Sequences in my master sequence.

My screen (Program tab) goes black whenever I get to the second, third or fourth (never the first) super in each of my nested sequences inside the master sequence! It stays black to the end of the Nest, even though there are no more supers.  When the next Nest in the Sequence starts, I get my video back until it hits the second, third, or fourth super.

It happens to all my Nested Sequences!

I tried several fixes, like rendering the preceding sequences, re-rendering the V2 that's in place where the trouble starts, uninstall and reinstall Pr, re-install GPU and CUDA drivers, changing Sequence Settings to use different Preview codecs... pretty much everything I could think of.

What gets around this is to turn off CUDA in Project Settings and use Software Rendering.  That allows me to see what I'm doing and render it, but as you know, the rendering takes at least four times longer.

Has anybody seen this and know a fix?  Help!

MacPro5,1 - 10.13.5 - Titan X GPU with latest drivers - 128 GB RAM - Latest Pr version 12.1.2

[Jim Curtis · Accepted solution]

Upon further testing, I've learned that something I failed to mention is the key to why my Nests are going black:

I have time-remapping applied to every Nest.  This is a problem.  And I just learned this is a known bug:

Re: Nested sequence time remapping bug