What happens when you press the Tab key? Or click on one of the preset workspaces?
Nothing happens when pressing the Tab key and same when clicking one of the workspace preset
Sorry to hear about your experience. I'd recommend resetting preferences of the app manually once. Please follow the instructions below to do that:
**Please note that resetting preferences will remove all the custom settings and Illustrator will launch with default settings. This way all your old settings will be saved in .old folders and Illustrator will recreate new folders with default settings.
Let us know how it goes. Looking forward to your response.