Hello,
I am able to create bookmarks (i.e. ctrl-b funtionality) for a GTK+ project (using C99 if that matters).  Bookmark functionality works perfectly until the project is closed.  Once it is reopened ALL bookmarks are gone;  no bookmark is saved.  Currently I am using v13.12.
I had a similar problem on v10.05.  The problem on that old version was that sometimes bookmarks are saved, other times they were lost.
Is there anyone who can confirm if this is a bug or not?
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Details:
Code::Blocks 13.12 rev9501
Build:  Dec 30 2013, 01:24:19 - wx2.8.12 (Linux, unicode) - 64 bit
SDK Version:  1.19.0
O/S:  Ubuntu 12.04.3 (64 bit)
Program was installed from Pasgui's PPA.