Hi,
Maybe some 3rd party plugin corrupted your user settings,
I suggest resetting them:
1- Close 3DS Max
2- go to: C:\Users\YourUserName\AppData\Local\Autodesk\3dsMax\20xx - xxbit
3- Rename the folder called ENU to something else like ENU.old
4- Restart 3DS Max
Note: AppData is a hidden folder, so you need to enable the visibility of hidden files and folders
From the Control Panel
Also, by doing this, you'll lose any custom UI configurations,
Or any custom 3rd party Macroscripts you installed, and you'll have to reinstall them again.
If renaming the ENU doesn't help, then close Max, delete the newly created ENU folder,
And then rename the old one ENU again, this way when you restart 3DS Max you'll have back
All your custom UI settings and 3rd party Macsroscripts.
If resetting the user settings helped then you need to figure out which plugin caused the issue
And avoid installing it again
its issue of Rayfire
After installing physX My problem is gone