Yes, most probably you need to disable the symbol browser in the code completion settings.
Debian has only wxgtk 3.0 and the symbol browser is known to cause problems in this version.
Thanks, I will give it a go.. is there any chance to install wxgtk-2.8 that you know? the symbol browser is quite useful
Yes, if you know how to build a Debian source package then; you can install wxgtk-2.8.
I forgot if I built Code::Blocks from source or from a Debian source package after installing wxgtk-2.8.
I did this about 6 months ago; so, it is possible that a few new issues might exist, now.
I did NOT test much of Code::Blocks other than the Compiler Plugin.
Tim S.