You used to be able to just click on a direct link to step from META to TeX.SE or vice versa. This is gone from the latest interface upgrade. Was there a good reason for this?
This is status-bydesign as it's a feature of the new top bar. The link is in the 'StackExchange' menu (top-left of screen), where the link for the meta site is directly underneath that for the main site. The same applies to every other StackExchange network site in the menu.