Navigator Window will not open
The latets version of SentryOne Client does nothing when you go to View, Navigator. THe navigator window does not open. How dso you get to the navigator window?
Vlady is right, though our support forum is moving here and that's where new product-related requests should go (this forum is for execution plan help specifically).
In the meantime, have you tried Tools > Reset Layout? Sometimes what has happened is you have inadvertently dragged the navigator panel off the window, and it's hiding behind the UI or on a different screen.