Hi
(Sorry for my poor english)
It might be a (recurrent) display problem in case you do not have enough available RAM. How much installed and available RAM do you get when this case happens?
In fact, in case of RAM shortage, tasks might not be duplicated. (you can check it via a macro in VBA: just count tasks, for instance. Or just save, close and open again your project)
The tasks might only be duplicated on display.
Problem might disappear if you choose one or more of following solutions if you do not have enough RAM:
- do not work too much time with a lot of projects (>8 to 10), or do not sollicitate too much what I called the Project graphical display interface manager (which do not manage very well the Windows graphics cache manager) when launching many print previews or displaying too many Graphical views (Gantt, task usages, resource usage,...) during a session.
(Note: you may use the "Hide Window" function to only display your active project)
- reset your PC and start to work only with MSProject (no more other apps open, like Outlook, Lotus Notes, Powerpoint,...)
- add RAM ,if you can (> 2Mo is good, but with 3Mo, you'll feel better)
Hope this helps
Victor