1708 MTP device field edit fails

[chrisjj]

1 In My Computer, find a track on n MTP device e.g.http://i.imgur.com/T3XFFPt.png
2 Change a field value e.g. http://i.imgur.com/YAc09QI.png
3 Click off that node, and back
4 Inspect field

Expected: new value
Observed: old value e.g. http://i.imgur.com/L2Q33gx.png

5 Inspect device

Expected: new value
Observed: old value

Suggested fix: disable edit on fields that cannot be edited.