Today we got a new release of Dolphin Viewer 3. If you have an ATI/AMD video card, you may want to avoid this release or read carefully before attempting to use the new release.
Texture Compression
A new feature was added to help those with lower end graphics cards, those with less video RAM. Just as textures are compressed for downloading to save on bandwidth and storage space, so too are textures compressed as they are placed into video RAM.
If your card has less then 512mb of video ram, compression will be turned on by default. If you have an ATI video card, keep it turned off.
Preferences->Graphics->Hardware settings.