Affects me; can be worked around by restarting the graphical manager.
On a laptop, putting the machine into hibernation by closing the lid
rectifies the situtation by (seemingly) restarting Unity, although it
will freeze again if window spread is used again.
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Can confir, Ubuntu 14.04 with Logitech H340 USB headphones. When they
are plugged in, the pointer controller decides that the LMB is being
held. RMB, MMB, scroll, and pointer location all function across
touchpad, USB mouse, and graphical tablet, but LMB does not. Running the
3.13.0-23-generic kern
*** This bug is a duplicate of bug 993655 ***
https://bugs.launchpad.net/bugs/993655
Public bug reported:
Ubuntu 14.04 with Logitech H340 USB headphones. When they are plugged
in, the pointer controller decides that the LMB is being held. RMB,
MMB, scroll, and pointer location all function