System Information
Operating system and graphics card
OS X 10.8.5 GeForce GTX 660 3072 MB

Blender Version
Broken: 2.7 19e627c
Worked: (optional)

Short description of error

Scene file with multiple linked rigs/assets, when Saved-as or Save copy'd to parent directory (or elsewhere I presume) all texture images from linked assets are missing. Tried with remap relative on and off.

Hard to supply a .blend. Sorry. Let me know if there is a way you want me to do this.

Exact steps for others to reproduce the error

Examples of my file structure relative to original .blend:

../../models/characters/boy
../../models/scenic/tree etc.

And all linked asset's textures are in subfolders, mapped relatively within their files like:

//textures/hair.png etc.

I don't want to have to use absolute file mapping with my assets, as that will break other workflow scenarios for me.

Apologies in advance if this is my error somehow.