Same problem here.
When I save the .max file (on my C:/ or in network), I receive this message:
"Error writing to file"
Then, 3ds Max crash immediately.
If I delete the CoronaScatter object, the saving process works fine and I have no error.
So, here, the crash is related to the CoronaScatter object.
If I import this CScatter object in an empty scene, and try to save, 3ds Max crash O_O
The "funny" thing is that, in this scene, I have another CScatter.
And, with this CSCatter in the scene, I can save with no problem.
It's the first CScatter to create me problems.