Lightselect Lights Being Deleted

[MAY3D]

Hi All

I have an interior render scene that I'm using for multiple product renders and on 2 separate occasions the lights I have saved to Lightselect elements have been deleted, so none of my saved Lightmix presets work, as all lights are moved to "Rest (Unassigned)". The lights are all still in the scene, I haven't changed anything. This seems to be a bit of a bug, but not sure how I might replicate it. Has anybody else experienced similar?

The products are Xrefs and I'm queueing all of my renders via Backburner 2019 from 3ds Max 2020. I have 100s of renders to complete over the next few weeks, so can't afford to keep having to re-render them, any help would be greatly appreciated.

Thanks in advance

[wilbertvandenbroek]

I don't have the same issues but have you tried testing without the xRefs?

[MAY3D]

Thanks for the suggestion. Haven't tried that yet, as I've got so many renders to do, I'm just pushing through. Thankfully it hasn't happened again since I started this thread, so no idea how I might replicate it. Only thing I've changed on my PC was updating to latest Nvidia Studio Drivers, but can't see why that would effect it 🤔