Workspace is gone everytime I open Illustrator

Hi there,

Sorry to hear about your experience. I'd recommend resetting preferences of the app manually once. Please follow the instructions below to do that:

For MAC 

• Close all Adobe applications. 
• Go to locations 
• ~/Library/Caches 
• ~/Library/Application Support/Adobe 
• ~/Library/Preferences 
• Rename  Adobe Illustrator, com.adobe.illustrator and Adobe Illustrator 25 Settings folders to   Adobe Illustrator.old, com.adobe.illustrator.old and Adobe Illustrator 25 Settings.old 
• Launch Illustrator from the Creative Cloud. 

For Windows 

• Close all Adobe applications. 
• Go to Location C:\Users\user\AppData\Roaming\Adobe 
• Rename  Adobe Illustrator and Adobe Illustrator 25 Settings folders to Adobe Illustrator.old and Adobe Illustrator 25 Settings.old 
• Launch Illustrator from the Creative Cloud. 

**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.

Regards,

Ashutosh

What happens when you press the Tab key? Or click on one of the preset workspaces?

Peter