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Pacman hangs at opening a package


I'm trying to use this for packages created in SSIS 2008R2.
Since I do not have a Visual studio Pro installation I built the project with Visual studio express 2010.
But when I open a project , a file or a package, pacman locks up immediately.
I used to work with vb before the .net era but I have never worked with C#.
Any help on where to look why the applications hangs?