Dr_Eckleberg

No idea, sorry. Does this happen in vanilla Minecraft too?

Wow, that's it? Thanks! I was worried it was going to be a lot more.

I didn't modify minecraft.jar, nor did I modify any class files in modpack.jar. I copied some class files from minecraft.jar to modpack.jar. I think it has to do with META-INF. Assuming I am correct on how modpack.jar and minecraft.jar are used, you need to delete the contents of the META-INF folder in modpack.jar if you are using Windows. If you are using OS X, delete only MOJANG_C.sf and MOJANG_C.dsa. Correct me if I am wrong, jakj.

I selected and copied all the class files from minecraft.jar, but chose not to replace any when pasting them into modpack.jar. So no, none of the class files that are in modpack.jar should be overwritten. The class files come from Tekkit's minecraft.jar, but I don't know that the class files from vanilla won't work. I don't actually have a list of which class files are necessary. I don't see any harm in copying all of the class files that aren't already in modpack.jar, but I'll try to make a list of required class files tomorrow.

So I finally got daxnitro's shaders, including Sonic Ether's shaders, to work: [img width=600] More screenshots: http://imgur.com/a/hjW1d The following are the steps I took to install the shaders on my Mac. I don't know what differences there will be for PC/Linux users. 1. First you'll need to copy bk.class, ep.class, and ey.class from minecraft.jar into modpack.jar. 2. Download the installer from daxnitro's thread: http://www.minecraftforum.net/topic/120261-125-glsl-shaders-dof-bump-mapping-waving-wheat-dynamic-shadows-and-more/ 3. Download the shaders for 1.1 from his repo: http://nitrous.daxnitro.com/repo/ 4. Open the installer and right-click and disable any selected mods. 5. Go to File > Import and select the Shaders.n2 file you downloaded from the repo. 6. Go to Options and select modpack.jar from your Tekkit folder. For Mac users, it should be /Users/username/Library/Application Support/techniclauncher/tekkit/bin/modpack.jar 7. Click Install