I've recently run into this problem. When I go to play League, I click to start. The League of Legends picture pops up in the middle of my screen like normal before it even loads the patcher. But what it does is flash. It just sits there and flashes as if it's selecting and deselecting the program. I cant keep another window focused like a web browser or even windows explorer. Its constantly deselecting what I'm trying to do and flashes, repeatedly.

I've tried running the various things in the toolbox. I've reinstalled this game at least twelve times in the past week alone and it works for the time I play it. But once I stop, logout. Then come back to play. It repeats the issue. I've had to reinstall the game in order to play it for one session. I'm getting to be at a loss as to what to do and get this fixed.

Sarukei,

Try this,

Primarily a DNS issue,

1.)
-open start menu
-type cmd in the box
-right click cmd run as administrator
-type in ipconfig /flushdns

2.) http://na.leagueoflegends.com/board/...1772970&page=4

3.)
*On Windows 7 go to Start -> Control Panel
*Then Click on Network and Internet -> Network and Sharing Center
*Click on Change Adapter Settings on the left hand side.
*Right Click on the Network you are currently connected to and select properties.
*In the selection box you should see Internet Protocol Version 4 (TCP/IPv4), select that and click properties.
*At the bottom where it says "Obtain DNS server address automatically" select the choice under it which reads "Use the following DNS server addresses:"

Preferrered DNS server: (fill in with) 8.8.8.8
Alternate DNS server: (fill in with) 8.8.4.4

Save your changes by clicking OK at the bottom and try restarting the LoL Client.

Flushing my DNS.. why didn't I think of that. *Feels silly now*

That worked, thank you very much.

I am having the same problem. I flushed DNS and reconfig'd as suggested, and it still doesn't work.

I followed a remedy posted in a different thread of deleting certain folders within the League of Legends folder and subsequent re-patch, and while that worked yesterday, upon closing of the client and restart I am back to my launcher not starting the client. I should not have to re-patch for 20-30 minutes before playing the game every time, and I should not have to leave my LoL client open for days to work around this (inb4 QQ).

on a related topic: Riot needs to skip releasing the next character and spend an ENTIRE 2 weeks of development and manpower to fix bugs and client related issues (the forums have plenty). Ever since Dreamhack there has been a marked decrease in game quality, server up-time, and customer service initiatives.

Alright well, flushing my DNS was a temporary fix it seems. It worked about twice before it went back to doing its flashing of the League of Legends logo. I'm no understanding what's going on. Nothing is different about my PC. I've been playing this game forever now and this is the most trouble I've had at playing the game, if I get to play.

-I've tried flushing my DNS.. fixed it for about two runs before it started repeating the issue.
-I've even tried replacing the RADs file with the one from the toolbox but that doesn't work.
-I've reinstalled about 12 times today only to have the same thing happen again.
-I've Uninstalled my .net framework and reinstalled it.

I'm at my wits end as to why this is happening. I feel like I dumped a whole lot of money into the game recently to get about 5 hours worth of play in the past three weeks?