Hi Karina,
Thanks for your reply. I also contacted yesterday Wix Customar Care, who replied very promptly. Before that I was able to fix the issue. Deleting browser data did not work. I am using Editor X on Chrome on a Windows computer. I looked up the hidden ‘Appdata’ folder in the Users folder. In this folder under Local>Google>Chrome>Defualt>IndexedDB I found the folder https_manage.editorx.com_0.indexeddb.leveldb. After deleting this folder the editor reloaded again as before.