There is a problem with textures. In PBR equipped viewers, both the current LL viewer and Firestorm Beta 7.1.4.73289 one specific texture (a "normal") is accessible via the main inventory floater but NOT via the edit floater's texture picker.
The non-PBR Firestorm Release 6.6.17 does NOT show this issue and it has never been an issue before.
The problematic texture is the ONLY texture in my inventory that has limited permissions (in this case No mod and No transfer).
There must have been a change in how permissions are handled by the viewer in the creation of the PBR code. This CANNOT (surely) have been intended behaviour?