I'm sorry for the necropost, but I'm experiencing the exact same issue as the OP.
I'm on a Debian 64 Jessie, and I've installed codeblocks from the backport repository
deb http://http.debian.net/debian jessie-backports main
I can't use the version of CB from svn since I require a stable programming IDE for my projects.
I'm using xfce4 and, as some people already points out, the problem might be related to wx3.
I've already reply on the sourceforge post confirming the behaviour.
P.S. a completely unrelated question: why CB is not present in the main debian repository? (yet it's present in the backport ones)
Moreover, is it possible to roll out an hotfix for that? (i know nothing about the packet policies)
Without using my custom shortcut I'm not sure if I can keep CB as my main IDE, and switching to another one is always troublesome