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OS X 10.8.2
2 GHz Intel Core i7
4GB 1333 MHz DDR3
AMD Radeon HD 6490M 256 MB
Weird particle errors/ missing particles such as Staatik Shiv, Leona's Passive(e.g. appearing in spots in the bush or in lane that just randomly floats), Nasus' Ultimate (blue squares are occasionally seen in place of particles)
Bush shadows often have shadow errors
Occasionally my game will crash/quit with no error messages/bug splat messages after I finish a game.
Computer lag will suddenly spike when i try to command-tab. Could just be my hardware but I've noticed it does not happen all the time, and I only have skype running together with league at the same time.
a rare occurence would be that my game client (not chat/pvp client) will not come up after champion selection and I have to restart client.
I unfortunately have never had any bug reports, otherwise I would be able to upload them. Hope this helps!
EDIT: Will be updating this post for more bugs that I can find/remember/observe.