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The message displayed during shutdown is like this: prl_disp_service didn't act on sigterm That means this process just won't terminate itself.
I've reported the problem with a id of 102643. If I do not remember it wrong, I just used the default setting during the installation of virtual...
I experienced the same problem with Parallels Desktop 4.0. OSX leopard takes a long time to shut down. If boot with "-v", it shows something...