The 19 May 2008 build (5074) is out.

[pasgui]

press the space key doesn't insert a space character but open the code completion pop-up menu.

Try this:
- close CB
- rename "cbKeyBinder10.ini" under the $HOME/.codeblocks directory
- restart CB

Be carefully, your previous setting will be deleted. Or instead, go in the KeyBinder configuration and for the "code completion" item, press again "ctrl+space" and validate.

Regards, pasgui