No, the window with the tabs Preview and Render is still there plus the Poser Library panel.

Its the main Poser window that has the editing tools, Camera controls, light controls, Plus all of the tabs (Pose, Material, Face, Hair, Cloth, setup & content) etc that has disapered.

I'm used to the library going walkabout but not the main work screen?

There was no crash, error messages or dump files?