Chunks loading problem

Hello.

Sorry if this bug was reported before, i don`t find exactly the same issue.

My demo for you: http://www.youtube.com/watch?v=Pf-FtC6zoaE&feature=youtu.be

On start chunks are loading well but when i go outside of the loaded chunks, new chunks not loading well. They loading, but only there where i`m looking, not like in settings radius, I tried reinstall windows, i add more RAM now it`s 6GB on windows 7 x64. But it`s still not loading until i press F3+A. So i always playing with F3+A

Thank you!