Can you go into settings /applications /manage applications / chess.com
clear data and force stop, then un-install and go back onto the market place and re-install the app.
I updated my Wildfire and the Home/House icon is working for me.
Let me know once you've either re-installed or updated if its still not working.
I guys, when I'm playing on my phone (HTC Desire - Android) the HOME icon doesn't appear to work. I play using the chess.com site rather that the app because I prefer it. Is the is a common problem or is it just me?