Terminator: using transmission all output goes to the focused terminal instead of going to all terminals

Selecting Transmission to all and pressing a keyboard key, this results in the key being transmitted only to the focused terminal and multiple times (one per intended terminal).

Step to reproduce:
* open terminator and split view vertically to have 3 terminals
* select trasmission to all from menu
* press key "a"

Obtained result:
* focused terminal panel shows the string "aaa", all other terminal panels are unmodified

Expected result:
* all terminal panels show "a"

This bug was not present in ubuntu 13.10 and is present in ubuntu 14.04.
The bug happens also using transmission groups. The number of characters displayed in the focused panel is equal to the number of panels in the transmission group

The only customization I've made to preferences that I remember is setting scrollback to 5000 lines

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: terminator 0.97-2
ProcVersionSignature: Ubuntu 3.13.0-24.47-lowlatency 3.13.9
Uname: Linux 3.13.0-24-lowlatency x86_64
ApportVersion: 2.14.1-0ubuntu3.1
Architecture: amd64
CurrentDesktop: KDE
Date: Thu May 15 10:23:33 2014
PackageArchitecture: all
SourcePackage: terminator
UpgradeStatus: Upgraded to trusty on 2014-04-24 (20 days ago)