​​Cannot assign new material or display properties of material in Creo Parametric

​​Cannot assign new material or display properties of material in Creo Parametric

​The custom made MTL file could be invalid due to various reasons, e.g. a missing apostrophe in a string assignment

​​If it is not possible to assign new material or display properties of a custom made MTL, then try the following steps:

  1. Open the faulty MTL file in Notepad++

  2. Also open a working MTL file in Notepad++

  3. Compare the files with a Notepad++ plugin

  4. Make necessary changes to make the MTL valid, e.g. close string assignments by adding missing apostrophes