Can't play custom games on Forge maps in H5

So I just downloaded a cool map and wanted to try it out, its called Emerald Coast and its in my bookmarks, but whenever I try to load it up in a Custom Game I get suck in this screen.

I loaded up a Fathom game and it worked, but this one won’t. It has worked on other people’s gamertags, and it works in Forge for me, but if I try to play a Custom Game on it I get the black loading screen for 10+ minutes and am forced to dashboard out and quit H5.

Any suggestions?