First of all, we are very sorry for this sudden inconvenience! It couldn't have come at a worse time, what with me being out of town on a family vacation this week :(
It's actually a very simple fix though to get your site back up and running.
Youtube recently changed its API for the youtube subscriber count mechanism. Go into your social counts widget anywhere it is present within your theme's widget panels and disable the youtube subscriber count option (you can leave the other social count options enabled). We will be rolling out updates with the fix as soon as we are able to.
Most likely we will be completely removing the youtube social count component from the theme in favor of using a plugin instead, since technically this is plugin territory rather than theme territory anyway.
We have fixed all of our themes where this was an issue. Please update your theme which will fix this issue.