Reverting to Default Theme?

Hi.

I have been using a theme based off of Obsidian for several years now. It look(ed) like this a few hours ago: http://209.85.215.104/search?q=cache:mHBUlN9UUJwJ:obscuresound.com/+obscure+sound&hl=en&ct=clnk&cd=1&gl=us&client=firefox-a

Now, it is set to the unattractive default theme: http://obscuresound.com

I did not update any options regarding the theme and the “design” page in the admin control panel still says that I am using the Obsidian theme. I am using 2.5.1

I appreciate any help. I have no clue what is wrong.

Thanks,
Mike