Hello,
We’ve experienced this issue before: http://wordpress.org/support/topic/cannot-create-code-block-on-fresh-install
We detected that the issue is because of the Theme is being running Javascript code in the CJT page where it shouldn’t do, causing error that prevent CJT Javascript from being loaded.
The issue might also caused by other Plugins that runs broken Javascript code in CJT Page.
You might give it a test by deactivate the Theme.
Please let me know what happened.
Thank you.
Regards,
AHMeD