scim freezes keyboard input in java, firefox (possibly other applications)

[Sampi]

Binary package hint: scim

-I'm using Ubuntu Intrepid 8.10.
-I'm using SCIM 1.4.7-3ubuntu10.
-What I expected to happen: SCIM should work in all applications at all times and keyboard input should not freeze
-What happened instead: Keyboard input freezes (keyboard not responsive including keyboard shortcuts) when multiple applications are open and windows are switched using Alt-Tab.
-How to reproduce:
1. Open SCIM.
2. Open a Firefox window.
3. Open a Java application.
4. Type something in Firefox.
5. Switch using Alt-Tab from Firefox window to Java window.
6. Try to type something the Java window.
7. Keyboard input freezes in either Java window or Firefox window.

-Workaround: Close (or kill) SCIM and reopen the applications.

I've tried different settings for im-switch (scim, scim-bridge, xim, etc).
I only tested Sun Java 5 and Sun Java 6.

I'm not sure if this is a duplicate bug but I failed to find a good bug report that either wasn't marked as Invalid or Solved.
Thanks for the good work, launchpad. I hope I can help solve the problem.

[Omar Islas (omar-islasrm)]

Same problem.
It happens on any web browser, when you have an input box, and you have for example the username input. You start typing and the auto completion appears, the moment it disappears (you enter another username not listed or finish to enter an existed username) the keyboard stops working, and you have to switch window 2 times (alt+tab) in order to work again.
I've had this problem since ubuntu 11.04, now I'm using 12.10 and it's still happening.