forced to mobile versions of websites
Problem: when I try to view http://www.mcdonalds.com, I am sent to http://mobile.mcstate.com
I assume that something in the response from Blackbird causes their website to think I'm using a mobile browser...

There are two known sites whose “sniffer” code we believe causes it to believe you may be coming from a mobile browser. We are looking for a fix to this issue. Thank you for reporting it. It looks like site browser “sniffers” are moving to a model where OS specifically needs to be passed to the site.