This Service Pack fix issues with stability and for example performance issues with Freeze brush and issue when Eyedropper tool picks wrong colour to some areas and many others.
Some of the changes:
· Some SDK examples are not working.
· If "Solo as diffuse" is ON in the Preferences, Unsolo will not work.
· When using a tablet (in pen mode and in mouse mode), some items in the interface (buttons, windows, menus, dialog boxes) do not work properly.
· Exporting FBX files with multiple PTEX meshes that share the same material and PTEX meshes not currently at level 0 does not work correctly.
· Unmasking then undoing produces spikes (points shoot out of the mesh).
· Textures from imported MUD files may be lost after saving.
· Can't import UVs after Create UVs. A warning message pops up.
· Crash deleting a joint after its mesh has been deleted.
· Mac OS X only - Auto Tile Loader doesn't work after releasing Command key.
· Marking menus do not show up in Hot box with dual monitor setup.
· Grab tool with mirror doesn't work when the mirrored cursor is outside the viewport.
· Stencil editor canvas should be subdivided to level 3 by default.
· Extract Texture Maps on PTEX models allows the user to save non-PTEX files and produces error messages.
· .....
If you want to know full list of fixed issues, follow original article: Mudbox