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Create a new C/C++ project on client A, import it into your subversion server, checkout it on client B, add a configuration (project properties > manage configurations) on client A, commit from client A, update on client B... and you will not see the new target on client B. This makes Netbeans not usable in C/C++ team projects :-\.
It seems that if you reload the IDE sometimes it loads the changes to project configurations.
*** This issue has been marked as a duplicate of 146701 ***