So I start playing my singleplayer world. I decide to collect some wheat from my farm (as usual when I first enter). Just a few weeks ago, this weird glitch started happening. First, when I look somewhere far (about 14-16 chunks away), it would start flashing. I press F3 and it starts saying 0 chunk updates time to time. I don't really mind it at first (since I don't really look up anyway), but then if I don't do anything about it, any words in the game will turn into these white vertical bars, and my toolbar for my mac starts to spaz out as well. I tried doing that f3+a thingy but it only works for a short period of time. This happens for any texture pack I use and for some reason the development console doesn't say anything suspicious. PLEASE HELP!!!