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I checked out two projects from cvs as free from projects to use the build.xml stored with the project in cvs. (release_x and release_x_bugfix). When starting a debugging session I noticed that the actual code step shown in editor is placed (somewhere) in a class file of the wrong project. I checked the version of the build.xml, but it was the right one. Even after closing the other project the wrong class file was shown in editor.
This is actually a duplicate of issue #52180. You can use the Sources window (Window -> Debugging -> Sources) and select just the one project there. That should help. *** This issue has been marked as a duplicate of 52180 ***
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.