I receive an error while in pre-match champion selection while trying to change or edit masteries. Once the match starts, I am stuck with fervor of battle as my keystone.
This has now happened two matches in a row
The same thing happened to me after changing around the order of some of my masteries. I've come to the conclusion that it has something to do with changing the names of the pages to things that are too similar (or in my case the same thing with different letters being capital). Hope this helps.
Edit: I had to close the client and then rename the pages in order for it to stop.
