Ever since the new client, there have been instances where masteries in Champ Select go crazy. They get sort of glitch out, not letting me change the masteries within a page, or even being able to change a page for different champs, etc.
Sometimes it even glitches WHILE I'm changing masteries. Just now I was trying to change my masteries for Jarvan , taking some points out of Ferocity to move to Resolve, when it just froze. I couldn't remove or add new points to the tree, or even change the page. This has happened about 3 times now, once even going into a game without a Keystone due to this freeze mid-mastery change.
If someone could explain the problem, or a Rioter to be alerted about it, I'd be happy