FYI, there has been suspects that the bug comes from SCIM,

(1)
see bug report from Qt-creator user
http://lists.trolltech.com/pipermail/qt-creator/2009-March/002320.html
(2)
Solution proposed by the Qt-creator Task-Tracker:
http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry&id=214144

Copied from the task-tracker

Description

Input from keyboard may stop working input fields on X11 when using an
XIM input method like SCIM. This can be reproduced with the application
example when having the XMODIFIER environment variable set and holding a
key down while pressing the "save" or "save as" menu entry. This makes
it impossible to input anything in the QLineEdit of the QFileDialog.

Won't fix:
The problem only occurs whe using SCIM via XIM (X Input Method). This doesn't 
happen when using a Qt IM module like scim-bridge. So the workaround is to set 
scim-bridge immodule as the Qt's default input method by either setting 
enviroment variable 'QT_IM_MODULE=scim-bridge' or adding a configuration option 
'DefaultInputMethod=scim-bridge' to $HOME/.config/Trolltech.conf configuration 
file under the 'Qt' section.

(3) I installed scim-bridge-client-qt4, and then set the environment
variable 'QT_IM_MODULE=scim-bridge'. It solved the problem.

My configuration:
Ubuntu 9.04
2.6.28-14-server
Qt-Creator 1.0.0 (9.04 distribution)
scim-bridge-client-qt4: 0.4.14-2ubuntu5

-- 
qt-creator doesn't accept input after auto completion
https://bugs.launchpad.net/bugs/343659
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