I started with DP1, updated to DP2 and then DP3. In all 3 versions, Apple Mail is completely broken and I can't add any accounts (I'm trying to add Gmail). Clicking File > Accounts, the Accounts is blanked out and can't be clicked. Going into System Preferences > Internet Accounts, I've got Gmail/Google added already but the checkbox for Mail is again blanked out, and I can only sync calendars, address book etc. Anyone else have this problem??