Launcher crashing when accessing loot tab and repairing doesn't help

From what I've read, I'm not the only one experiencing this. I bought a mystery champion shard and wanted to use it, and the game crashed upon accessing the "LOOT" section. I've searched old forums, and tried what I've read there. The game has been repaired, and I've tried reinstalling and restarting my PC to no effect. I would appreciate a fast reply as I want to resolve this ASAP and get back to playing the game. Thanks. :)