wont let me select role

after a game if i hit play again instead of quit when i get to the lobby and go to select my role it doesnt select it and then kinda locks up. i close lol client and when i restart it the screen res is back down to 1024x576 instead of the 1600x900. the main problem tho is not being able to hit play again and go into a new lobby and start a game. if i want to start a new game i have to quit first. on new client btw