Game isn't working properly (check description)

This issue did NOT happen in 1.7.5. It happened in 1.5.2. In my Survival world (that i sometimes change to creative bacause im not sure how to do keepinventory) I put two beds in my house, and it would never re spawn me there when I die, though it did before. Than, when I walked by a never-ending strip of chunks, it would not load a single block, and the game wouldnt let me move. This although happened in creative when there was a problem with the blocks. Here is a screenshot that I've taken during the issue.