Problems with my third brake light

Hi guys, I've got a 2004 Hemi. My high-mount third brake light has stopped working. I put in a new bulb, still no dice. The other two cargo lamps up there still work fine. I also noticed that the brake lights on my tails will now only flash when the vehicle is turned on.

Could this be a fuse issue? I looked at the fuse box with all the different entries and my eyes started to cross. Does anyone have any insight on the particular fuse I should be focusing on? Or is this not a fuse issue in the first place?

Any information you can provide would be greatly appreciated.