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