After using some keyboard keys cursor disappears in some apps

Test case 1:
With "Keyboard input method system" set to default of iBus
Open a text file in gedit
Highlight some text > go ctrl+c
Cursor (The I bar) will start flashing, disappearing while in gedit window

Removing focus from & back to gedit window will restore proper behavior.
If ibus-gtk is installed this behavior does not occur
Or if "Keyboard input method system" is set to 'None" this issue won't occur
(- both 'if's require a log out to effect.

Other apps are also affected in similar manner - see this report
https://bugs.launchpad.net/ubuntu/+source/gedit/+bug/1387219

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ibus-gtk 1.5.9-1ubuntu1
ProcVersionSignature: Ubuntu 3.18.0-8.9-generic 3.18.1
Uname: Linux 3.18.0-8-generic x86_64
ApportVersion: 2.15.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jan 19 13:44:38 2015
InstallationDate: Installed on 2014-11-16 (64 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141114)
SourcePackage: ibus
UpgradeStatus: No upgrade log present (probably fresh install)