I have access to 3 accounts that I login to using the PC Client. On one of these 3 accounts I seem to be locked out of Mod Battles through the Campaigns menu - Neither of the other accounts I use have this problem, and it is only Mod Battles. . .It sends me to a blank screen that I cannot back out from.
I have attempted deleting the game and reinstalling with no luck, and I've had no such problem with the mobile client. I have spoken to a small handful of other people who seem to also have this bug
Note: I can access the Mod Battles through "trickery" by going to the mod screen and "searching" for specific mods, to which case I can use that alternate screen to burn this energy.