With the new Minecraft 1.5 update, you no longer have to patch the client in order to use HD Texture Packs. It's now integrated into it. But I've had problems with the update that when I do use a HD Texture Pack (or any TP in general) it makes it a lot more difficult to use and gameplay becomes extremely difficult to do. Is anyone else having this problem? If so, drop a comment on how you resolved it. I currently use Defscape v 2.3 and it's extremely smooth. I've never had a problem with it until now.