Hi, thanks for the files.
We tried in a couple of workstations, but could not reproduce the problem using your scene.
It could be caused by something specific to your configuration (i.e. we have not TyFlow)
Anyway, checking the minidump, i see it crashes in a process used to clean the Forest template layer, when scene is saved.
For some reason, Max is sending a null reference to the plugin. Theorically this should not happen.
So i added a checking in the code, to handle this null reference and avoid the crash.
I will send you a custom patch by e-mail. I hope it works.