It is important that the lower anchor connector is always right way up – not upside down, or twisted in order to be right way up. See this previous post for pictures and info on this. When switching a Britax convertible** from rear-facing to forward-facing (or from forward-facing to rear-facing) it is necessary to switch the lower anchor straps so that the connector is right way up.
**This video applies to the following Britax convertible seats:
– Britax Marathon, Britax Boulevard, Britax Wizard, Britax Advocate
Note: it does NOT apply to the Britax Marathon Classic, or the Marathon 70, Boulevard 70, or Advocate 70. There are a few Advocates and Boulevards that were made in 2010 that have a different style LATCH connector that does NOT need to be switched.[youtube http://www.youtube.com/watch?v=ofxR6QxGwOM?rel=0&w=640&h=390]