Here is Avid's official response.

"Thank you for contacting Avid.

When applying a LUT or a Frameflex to a source clip, we advise you to transcode the source clip for the source transformation to apply.

In the transcode window, there are checkboxes besides "Apply source transformations".

Kindly tick those checkboxes then proceed with the transcoding.

See if using these transcoded clips could help with the issue.


Thank you very much."

Re-transcode multigrouped clips... I am flabbergasted.  

Have you tried selecting the sequence in the bin, the using the (right click) Refresh Sequence option? 

Thank you for replying.   Yes, afer each change we would try that.  

I actually got to the bottom of it though. It turns out there was a semi-corrupt LUT. I am not even sure how this can happen but it was working on some sequences but not all and was working on the source clip of the sequences it was not working on.
I asked the client to re-supply the LUT amd that worked as expected which is great news.

It was so confusing.

Thankfully it is fixed now, because I did not know what to try next.

Thank you, Rory

Hi Rory, I know it's been a while since you posted about this but I'm having the same issue as you did.  I've deleted the old "corrupt" LUT from the project folder and applied a generic one from avid's stock set of options (actually have tried a few).  I'm still unable to get the multigroup to show the LUT.  Was there another step involved besides bringing in and adding the updated file from the DP?  Thank you!

Following up after a call with AVid support. This is just how Avid works now - the engineers turned off fx to multigroups starting with 2021.  Apparently it caused other issues.  There is a known feature request but for now, bake in the LUT before multigrouping.

I think the only other thing to do is to refresh the sequences.  Right click your sequence in its bin and go to REFRESH SEQUENCE.  Then select COLOR ADAPTERS(I think you can select colour adaptors from here or just click ALL).  If you are on Media Composer First you will only have the Refesh Sequence option which will do all. 

https://community.avid.com/forums/p/181277/845051.aspx

Yeah, but the editor and director will want to see a lut in the source monitor.  I went back and transcoded with a lut applied. Ticking those boxes.  Thank you for the response Rory!

This is crazy!  There is a massive flaw in workflow if this is the case.  Has there been any release from Avid stating that LUTs have to be baked in before multigrouping (and therefore cannot be changed or manipulated after)? In my case the AEs would have to transcode 55TB of media doubling the space needed for the series too.

I cannot find anything online about it online. 

Either way my issue was with version 2018.  Here is another person having similar: https://www.reddit.com/r/editors/comments/l29yk9/avid_issue_no_lut_applied_after_multigroup/

Hi, LUTs DO work in multicam, just not by default. There is a setting under "Video Display" called "Bypass Frameflex & LUT FX in performance-critical modes (multicam split, render-on-the-fly off, playout to DV device).

Turn it off and then refresh your sequence and your LUTs are now applied in your timeline and your quad/nine split. This is working in 2018.12.15.

I find it strange that Avid's own support people didn't immediately direct you to that.

Andi