I have discovered lately that sometimes types "disappear" from the Library. This can be avoided for now by deleting Library.db before starting Max (it can be found in the library directory, the one that opens from the last option on Lab's File menu, usually C:\Users\<username>\AppData\Local\Ephere ).
Let us know if this doesn't work for you.
Ivan Kolev (Software Developer, EPHERE Inc.)
E-mail: ivan.kolev at ephere dot com
Discord: ikolev