Yep, I double click on the 3dm file on my desktop, tried to make the ui size smaller so every single possible palettes could be expanded.They could fit into the unmaximized window perfectly,reopened the file again and maximized the window, closed it again reopened again,but still all of them are closed except for subD/dim. Attaching a screenshot of the unmaximized window.

Edit: double clicking on moi 4.0 rather than opening a file with moi 5.0 beta solved this issue. Also pulling the 3dm file onto the moi 4.0 icon will open the project properly with all palettes open