Mudbox 2011 Service Pack 1 fixes the following issues:

Posing fixes

• Deleting skeletons in the Object List is now possible. (Right-click and select Delete Object.)
• Adding objects to an imported skeleton by painting weights is now possible
• Weights not propagating properly on subdivision
• Shadows and ambient occlusion display not updating when posing
• Various interaction issues when selecting and posing joints
• Imported n-sided or triangle meshes with bones cannot be posed when subdivided

FBX fixes

• Instances cause import error
• Textures display incorrectly in imported FBX files with different paint layer sizes
• Camera FOV and camera names from 3ds Max not importing correctly
• Crash on Mac OS X when importing malformed skeletons from 3ds Max

Stencil fixes

• Dry brush with stencil on not working correctly
• Painting using stencil crashes if stencil is 24bit/pixel .tga
• Stencil image should display full color only when the Projection brush is active, black and white when other tools are selected.

Edge Bleed fixes

• If a normal map is extracted using the Subdivision method, the resulting map does not have edge bleed
• Edge Bleed option in Preferences > Paint not working for ambient occlusion maps

User interface fixes

• 3ds Max hotkey settings are incorrect
• Brush resize down/up hotkeys not working on values larger than 100
• Shift hotkey not working for temporary weight painting smooth

Other fixes

• Flatten to UV space using mesh with no UVs causes crash
• Error using Eyedropper to pick color on mesh with no UVs. Mudbox now creates UVs automatically.
• Incorrect GPU RAM detection causing many warnings to pop up. See Environment variables for updated information.
• Depending on the shadow Depth Map Resolution and the size of the movie, shadows do not render correctly in turntable movies