Ah yep, that's the issue! HTTP_REFERER being sent out is blocked by default for all sites for my browser.

No worries, could be an issue on my end. I'm running Firefox 31.0.

I noticed an error while checking raffle ticket score and uploading an icon:
[removed screenshot link]

Both functions do what they're supposed to even though that error page shows. Other than that, everything is looking great so far!

Edit: Also popped up while posting this reply.