Public bug reported:

Observed behavior:
When using tmux, the terminal occasionally displays the "boxed" version of the 
0x001b character followed by two ']' characters either in the cursor's current 
location or at the end of a refreshed line, or sometimes at an apparently 
random position on the screen. The times at which this character appears seem 
to be completely random.

To reproduce:
Get a clean install of tmux and gnome-terminal from the repositories. It is 
difficult to quantify this, but it appears that the bug will present itself 
most readily when working in vim or another refresh-heavy cli program.

Why it's not a tmux bug:
The bug appears to affect gnome-terminal and terminator, but not xterm or e.g. 
sessions connected over putty. In fact, if I open all of these screens 
side-by-size (using a virtual machine), and simultaneously attach to the same 
tmux session, only gnome-terminal and terminator show the strange characters, 
while the other two terminals render the screen as expected.

Please see this superuser discussion for a link to a video of what the bug 
looks like:
http://superuser.com/questions/864364/tmux-printing-u0x001b-and-112-randomly

Let me know if there is anything else I can do to help reproduce/solve
this, as using xterm is a really bad workaround to have to put up with.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-terminal 3.6.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
Date: Tue Mar 24 10:30:12 2015
InstallationDate: Installed on 2015-01-11 (71 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-terminal
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-terminal (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1435905

Title:
  gnome-terminal randomly outputs control characters

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