500 Internal Server Error and Access-Control-Allow-Origin

Is no one else getting similar errors (looks like Gaubee might)?

```
OPTIONS https://api.github.com/repos/muffintheman/tipsy/git/refs/heads?1359485598135 500 (Internal Server Error) github.js:48
XMLHttpRequest cannot load https://api.github.com/repos/muffintheman/tipsy/git/refs/heads?1359485598135. Origin ... is not allowed by Access-Control-Allow-Origin.
```
