[Blurry Rigged Mesh Texture]

If I'm understanding correctly, it's not that there is anything wrong with the mesh or the texture.  The texture applied to the mesh just refuses to fully rez unless the texture in his inventory is opened.  I've had this happen before too, but it didn't continue for more than a day. Unfortunately, the only suggestion I have, if you haven't already tried, is to clear your cache.

[Rigged Mesh - Skin Weight]

I'm on a mac using 2.59 and have only had to use the 21 bones.

[Bone Weight Copy in Blender 2.5x]

I'm on 10.6 too and shift - select isn't working for me either.  I've just been right clicking to bring up the drop down menu when I need to select multiple items.

[Bone Weight Copy in Blender 2.5x]

Works for me, but the last one did too.   Thanks so much. Gaia!