TwentyTen 1.2 not picking up custom header on homepage

I just changed my theme to TwentyTen 1.2 and uploaded a custom header image. It has changed on all my archived posts, but not on the main page. How do I get it to change? I also added the Twitter Wickett Widget which is showing up on the archived pages, but not on the main page.

[I’m not very technically inclined, so if you could answer me like I’m your grandma, I’d really appreciate it! Thanks!]