Why do textures sometimes look messed up? - Video Tutorial
This article is part of the Extended Second Life Knowledge Base that includes advanced and specialized information. This information was originally provided by Linden Lab, but is not actively maintained nor guaranteed to be accurate. Linden Lab does not certify nor assume any responsibility for this information.
See the official Second Life Knowledge Base for the most current information.
Glitchy textures can sometimes indicate a problem with files in your Second Life® Viewer's cache. Try the steps in clearing your cache. Updating your graphics card drivers can also help in some cases.
In case the problem isn't Second Life-specific (such as hardware failure), running a stress test such as the ones available at the following links may help isolate the problem:
You can also try re-baking textures, as explained in this video tutorial: