Try opening a template from the project selection, to see if the problem comes from the project or the editor.
To debug the Editor, try running it inside a terminal, which will give you extra debugging information. To act on it, you can report a bug to the git, or directly compile you own editor.
If the windowing system is at fault, try not having the Editor maximised, to let the new window space. Remember to alt+tab to switch to it when it appears. You can also look into installing a tiling window manager, which will make sure that all windows are visible.