VS2010 editor window dissappears suddenly and the reappears

Just installed Reharper for VS 2010 and found that under certain circumstances, like Saving a project or compiling a project,
the Editor windows and all the tabbed code files just dissappear. After a few minutes they again re-appear in the IDE.
( I'm left with the VSTO parent window and the menu on the top , no toolbars either).
The Window menu shows all the windows as open..

while coding or working in the designer there is no problem.

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