I'm not sure if this is the same issue, but my middle click also stopped 
working after 13.10 upgrade.
I'm using Lenovo X1 Carbon and it has a hardware middle mouse button. Here's 
the xev output when I press that button:

KeymapNotify event, serial 37, synthetic NO, window 0x0,
    keys:  4294967198 0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 
  
           0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   

ButtonPress event, serial 37, synthetic NO, window 0x5c00001,
    root 0x9e, subw 0x0, time 4160630, (19,6), root:(127,1108),
    state 0x0, button 2, same_screen YES

ButtonRelease event, serial 37, synthetic NO, window 0x5c00001,
    root 0x9e, subw 0x0, time 4160630, (19,6), root:(127,1108),
    state 0x200, button 2, same_screen YES


So it gets recognized as "button 2" but for some reason the middle click action 
never happens.
However if I connect a USB mouse with a scroll wheel, the middle click action 
works. Here's xev output for USB mouse middle click:

KeymapNotify event, serial 37, synthetic NO, window 0x0,
    keys:  0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   
           0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   

ButtonPress event, serial 37, synthetic NO, window 0x5c00001,
    root 0x9e, subw 0x0, time 4248704, (146,11), root:(254,1113),
    state 0x0, button 2, same_screen YES

ButtonRelease event, serial 37, synthetic NO, window 0x5c00001,
    root 0x9e, subw 0x0, time 4248959, (146,11), root:(254,1113),
    state 0x200, button 2, same_screen YES


The only difference that I see is the weird value in the KeymapNotify event but 
it doesn't make any sense to me. Somebody please help, I'm so used to my middle 
button!

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https://bugs.launchpad.net/bugs/1247584

Title:
  [keymap] Since upgrade to Ubuntu 13.10, udev doesn't map middle mouse
  button.

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