Grey Spotify Icon on Cinnamon with Mint-Xtras

[legendeveryone]

Hey all, I'm having an issue with the Spotify icon displaying as grey, instead of its green color. I'm running Mint 13 Cinnamon, using the Nightlife - Graphite theme and the Mint-Xtra icon set.

I've checked all the folders within the Mint-Xtras folder in /usr/share/icons, and they all look correct. I'm not sure what's causing it to show as grey. Any ideas?

http://i.imgur.com/gmFPH.jpg