What version of Max are you using? I've seen a couple of people run into that issue, and I'm not sure what the cause is.
Either way, the solution appears to be to reset your ENU folder. Rename this folder to ENU_backup and then restart Max:
Either way, the solution appears to be to reset your ENU folder. Rename this folder to ENU_backup and then restart Max:
Code:
C:\Users\[YOUR USERNAME]\AppData\Local\Autodesk\3dsMax\[YOUR 3DS MAX VERSION]\ENU