If using a HD texturepack with 4096x4096 or larger cloud textures, the clouds are incorrectly rendered grayish-blue, cover the whole sky and have massive black stripes on them.
For example:
Using "clouds_2048_scuttles.png" (taken from Scuttles LB Photorealism), the clouds look as intended (apart from showing MC-8779, see screenshot "img1.jpg").
Using "clouds_4096_scuttles.png" (doubled resolution), the clouds aren't properly rendered anymore (see screenshot "img2").
EDIT:
Installing MCPatcher on Minecraft 1.5.1 fixes the problem, so it's not a hardware issue !
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GPU limitation you say? My grahpics card isn't that old and 1,25 GB graphic memory should be enough to render a 2 MB cloud texture ...
I've added some hardware information to this ticket just for the case 🙂
EDIT:
Tested it with my brothers ASUS GeForce GTX 670 (2GB G-RAM), same problem. It seems to be a bug of the Minecraft rendering engine.
EDIT2:
Doesn't happen when using a patched⚠️ 1.5.1 minecraft.jar, it handles 4096x4096 cloud textures absolutely fine.
This will never happen without external hacking on the 1.5.x version of Minecraft.
I'm working on new code for 1.6 that should handle arbitrary sized assets (as long as your gpu holds out).
Might be a GPU limitation... Some older ATI/AMD cards for example only support 2048x2048 textures with OpenGL.