[Client] Masteries in the new Champion Select

Windows 10 Professional Release Preview x64 Version 1511 (10586.104) Intel Core i5-3570K 3.40GHz 8.00 Go RAM

League of Legends 6.3.16_02_05_12_04 Error Message : "A suitable error message could not be found."

1. Go in the New Champion Select
2. Start Queue
3. Before the AFK Check, open one of your friends' Summoner Profile
4. Look for his Masteries
5. Accept the AFK Check

In the Champion Select, my masteries were weird. It happened to me only once.