Xenome just re install the whole minecraft. Re download your texture pack. Be sure to add optifine or another hd plugin that helps hd texture packs. if all of that dosnt work just use the original texture pack
deleting the whole minecraft folder seems a but much...try just changing the TP/using a different TP first
What does .jar has to do with a texture pack? Delete your tp, place it in again, patch, play, tell us.
yeah i just relogged and it fixed, it is really simple but here are some pics of the overworld & the nether