i got a file, with a few xref scenes, with a few ForestPack trees. Everything worked quite fine, until i decided to use a 3dlut in the VFB.
Since then i got several crashes when i try to save the .max file. Not doing anything specific else…
In case you have doubts the LUT file is the problem, please try it on a new simple scene.
Which is your Forest Pack version?
If the crash occurs on this project only, please send it together with all assets to support@chaosgroup.com.