(I'm using 4.5.16, which isn't available in the dropdown above).

I have created a test form page, showing both the default and md versions of the various inputs.

The material design select options don't display - though part of it is mixed up in the email address field. You can see this on the test page:

I've tried using various div names, without any difference

<div class="md-form">
<select class="mdb-select md-form mb-4 initialized" id="select">
<option value="" disabled selected>Choose your option</option>
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
<label for="select">Material select</label>
</div>

Thanks

Chris