Unable to open map folders when creating custom game

[DrunkenDirt]

When I try to open a map folder, such as "Frozen Throne" or "Downloads" when trying to create a custom game, my client bugs out. Sound effects stop, buttons no longer work and I have to Alt-F4 our of the game. I can still host the old maps that are in the default RoC folder, such as Booty Bay, this only happens when I try to open a folder.

Anyone know the cause of the problem or have any idea how to fix it?

Apologies if it's been asked before.