I've just got the latest version of max (2018)
When using the UVW Unwrap editor, the settings do not save when you select 'Save Current Settings as Default' in the drop down menu.
If you collapse the modifier, and then go back in, none of the settings are saved.
I've opened a bug with Autodesk, and posted on the Autodesk forum, but devs don't look in there.
Thanks!
Replies
2018.1 - http://www.autodesk.com/3dsmax-readme-2018-enu
2018.2 - https://up.autodesk.com/2018/3DSMAX/3dsMax2018.2_Update_Readme_enu.html
Can't find actual release notes/bug fixes for the .3 & .4 at the moment.
Daf