HUD keybindings change not working correctly

[Andy Whitcroft]

I have two machines which have a number of strange behaviours from the HUD key.

1) before attempting to change it away from its reported Alt_L setting, both Alt_L and Alt_R were showing HUD.

2) I was able to move it way from Alt_L to Disable it ok, then it was correctly Disabled, but when I connect it to my Mail button both Alt_L and Alt_R are enabled again and Mail does not envoke HUD.

3) I am unable to bind it back to Alt_L or indeed any other modifier, they all just flip it to Disabled.

I would note that this is not the same in a guest session. There the HUD key is Alt_L only and can be changed away to other modifiers, it cannot be changed back however to Alt_L.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.1.2+14.04.20140303-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-15.35-generic 3.13.5
Uname: Linux 3.13.0-15-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CurrentDesktop: Unity
Date: Wed Mar 5 09:56:15 2014
EcryptfsInUse: Yes
SourcePackage: unity
UpgradeStatus: Upgraded to trusty on 2014-01-17 (46 days ago)