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I can open my UML project, but when I try to expand one of the elements in the "Projects"-view in Netbeans nothing happens. The only visible change is that the plus-sign (which illustrates the expand-possibility) dissapears. That means that I am not able to open my class diagrams etc. If I right click e.g. "Model" under my UML-project and choose "New -> Package" and adds a new package the Model elements gets expanded and the sublements are shown underneath it. But also here I am no able to expand any of the elements. If I ones more choose one of the sub-elements of "Model" and adds a new package to one of those it gets expanded by I am not able to expand any of those elements either.