I am running Windows 10 and EN 10.0.10. When I click on the Notebooks expand arrow, my notebooks are not displayed and my notebooks list is empty. I know that my notesbooks are okay because I can see them through a web browser. Just prior to this happening I had created a new notebook and then added it to a stack. The stack was previously empty since I had moved the notebooks that were in out of the stack. How can I fix this so that the notebooks show up without needing to use the web browser.