New font is much harder to read, especially on mobile devices

[EarlG]

14. The DU3 "preferred format" settings do not apply to DU4

The DU4 layout is fluid, so it adapts to whatever device the site is being displayed on (well, in theory). If you're on a desktop computer you'll see the desktop layout, and if you're on a phone you'll get the mobile layout. If you hold the phone vertically or horizontally, you should get slightly different layouts that adapt to the orientation (for example, the navigation bar becomes much narrower on a horizontally-held phone).

Are you able to send emails from your phone? If so, please tell me what kind of phone you're using and I should be able to help you get a screenshot.