i don`t know what problem is
Looks like it's not switching to the proper shader. If you are using the 2.5.7 version from the forums, make sure you have all 3 shaders, so soft shading is supported.
I use version 2.5.1 from asset store How do I change shader when I use Dynamicfont with Material from the font, I can't modify anything in that material, not even the shader.