hummingbird interfering with MaxCDN settings

Hi, I have a question about Hummingbird. Recently, I noticed that MaxCDN does not work on my site, and when I asked them about it, they said it could be due to me having started to use Hummingbird. Instead of disabling Hummingbird, is it a part of the settings i can change that will make it work with MaxCDN. MaxCDN is part of the total cache settings.

Cheers, Ingier.