This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
Using Kubuntu, NetBeans 6 RC2. The Ctrl - Z works well but suddenly stops working, but it is possible to do it by using the toolbar button action.
This is already filed as issue 118038. Thanks for your report *** This issue has been marked as a duplicate of 118038 ***