Hi,
I found that Code::Blocks hangs when using autocompletion and the declaration being autocompleted is too long for the space available.
By resizing the editor window and triggering autocompletion I was able to reproduce this problem.
See the attached screenshot and project.
PD: I'm running Debian testing with official packages (Release 16.01 rev 10692, SDK version 1.29.0, wx3.0.3)