Almost every single time for me.

If I recently edited a Mastery Page, the PVP.Net client completely ignores what mastery page I choose in Champion Selection, and instead gives me that recently edited page.

This bug seems to go away for a short while if I delete my preferences files in the game folder, which completely erases my mastery pages. But soon it comes back.

happens to me too. sick of getting my mage mid masteries when I'm jungling or playing solo top

I have a way, it works for me. Once you get one the Champion Select Screen, go to edit masteries. Select the mastery page you want, and there is your page for the game.

Thanks Roy, works for me too.

No problem, good to see it works.

yeah its happened to me 2 games in a row where it doesnt give me the right mastery page.

Did you try my way using the edit mastery page? Works like a charm

yeah i just did and it works. thank you so much

It's no problem, I had the problem before. Lost by a lot, because I was accidentally an AP Pantheon. I soon found out how, and don't want others to do the same xD

Hopefully riot gets a fix for this soon. Since even though we know a work around we don't always remember to check which can mess things up.