Ok. Thanks for the info. I'm thankful its not just me who has been having this problem.
I haven't changed my graphics settings ever and this has never happened to me before. Definitely not what was shown in the post you said. However, the lines look similar but I'm not sure. I have a ATI Radeon HD 4850 graphics card. Also if anyone posts any comments here I wont be able to reply to them until 3PM Eastern Day Time. Its really late here. Its 11PM EST and I'm tired. 🙂
Yes those are what I am talking about but they seem more vivid on the block examples I gave. Also, these lines have never appeared in any previous versions of minecraft that I played.
You can see the lines better on dark textures when you place a torch down. However, the lines from a torch appear on grass and sand as well. (You can just barely make the lines out on sand)
This does not happen in any versions prior the snapshots. This does not affect any official releases of Minecraft.