Can't access the Gameplay tab in store.
trying to buy new runes but can't do that at the moment.
trying to buy new runes but can't do that at the moment.
I'm having the same problem, tried logging out and logging back in and no luck.
same
Same here. But Rito listens and they deliver! Not to worry, Riot will fix the problem. (I hope)
Same here! rito pls 
Riot is working on resolving the issue and getting the Gameplay section of the store working ASAP. Sorry for the inconvenience.
same here
Same here
Same. Even tried reinstalling the client but to no avail.