Hi Erica - it's the multiple class statements that are causing DW to get upset.
<td class="mobile" style="font-family: 'Montserrat', Arial, sans-serif; font-size:14px; line-height:20px; color:#757575;" align="center" class="body-text">
There's a number of these instances throughout the template. Once they're properly combined, which they did do in some places, DW gets much happier :-)
Perfect - thanks Wilbert.
Makes sense of course - a width of auto never implies anything more than 0 when it's parent is 0.
Strange that 4 and 5 choke on this though :-)