Got my chromecast about 10 days ago. Plugged into the back of my AVR, but wouldn't setup via the basement wire/lessrouter. House has wired gigabit so plugged in an old wireless behind the 1st floor tv parallel to avr as an extender. Chromecast setup fine this time. Tried casting a youtube flick using chrome tab casting. worked pretty well except it was some sync issues sometimes.
So I figure why not buy the new nexus 7 and chromecast from that. It works fine within the Youtube app, but there's no chrome tab chromecast extension. I called Google support they said that feature is being worked on for a later unspecified date. Maybe I should have not pulled the trigger so quickly.