At last i found out what caused the crashes on close workspace i was still having.
(I have a workspace with 2 projects, a app project and a static library, and my problem was that when code completion is enabled, C::B crashes when i close the workspace)
I experimented with a new workspace, with 2 new projects.
In the projects i gradually added the files of my old projects, until the new workspace crashed on close.
The file that caused the crash is a class definition file and the class in this file has the same name as a class in the library. The class in the library is in an other namespace, so this should be no problem.
It seems to be a problem for the code completion, causing the crashes.
I renamed the class in the app project, and the problems have gone!
wobien