Same issue. There is a work around that will fix the problem temp but we need an actual fix. If you float in window you can see your document. If you try tile, your doc disappears. This just started happening yesterday when I updated to CC 2019.

When I open a tool command dialogue box – such as 'rotate' object – the numerical input is not initially highlighted – I have to 'tab' through the options 5 times until I can input numerically how many degrees I want to rotate an object. Previously, this was not the case, the numerical input was highlighted, enabling you to immediately input desired number. This seems to be the case with all tool command dialogue boxes.

My OS is Windows 10.
I did provide a screenshot of the contents of the GPUCache folder. Do you need me to upload the files?

I also tried the solution which Nitish Agarwal suggested.
I could not find any processes in task manager named CCX.
I deleted the data folder from CCX Welcome.
Then I deleted the Adobe Illustrator 23 folder.

This has not resolved the issue.

I'm on a Mac. I killed the CCX process. When I then switched do Illustrator (which was open at the time), it crashed. When I restarted it, the welcome window worked.

Hi,

Please try the below steps and let us know if your issue is resolved or not.

Windows:
1. In task manager kill CCX process
2. In run command type %appdata%
3. Go to Adobe > CCX Welcome
4. Delete data folder
5. Go back in Adobe folder and delete Adobe Illustrator 23 folder
6. Wait for 5 min or till CC process in restarted(you will see the process running in task manager)
7. Launch Illustrator

Mac :
1. In activity monitor kill CCX process
2. Go to folder ~/Library
3. Delete Adobe Illustrator 23 folder from Application Support > Adobe
4. Go back to ~/Library
5. Delete data folder from Cache > Adobe
6. Go back to ~/Library
7. Delete Adobe Illustrator 23 folder from Preferences
8. Wait for 5 min or till CC process in restarted(you will see the process running in activity monitor)
9. Launch Illustrator again
Verify if the issue is resolved or not. If the issue is not resolved please reach out to me at nitiagar@adobe.com

Thanks & Regards
Nitish Agarwal

Hi,

Please try the below steps and let us know if your issue is resolved or not.
1. In task manager kill CCX process
2. In run command type %appdata%
3. Go to Adobe > CCX Welcome
4. Delete data folder
5. Go back in Adobe folder and delete Adobe Illustrator 23 folder
6. Wait for 5 min or till CC process in restarted(you will see the process running in task manager)
7. Launch Illustrator

Verify if the issue is resolved or not. If the issue is not resolved please reach out to me at nitiagar@adobe.com

Thanks & Regards
Nitish Agarwal

Hi,

Can you please share the OS on which you are working along with the GPUCache file.

Thanks,
Sarah

It won't allow me to open documents or create a new document since I updated my macbook pro 2017 to Mojave...

Likewise, Welcome screen/window blank.

same here too - annoying

Same here. Welcome screen/window is just blank.

I just updated to Illustrator CC 2019 but the application Welcome Screen doesn't load properly and doesn't allow me to create a new document. I use a MacBook Pro mid 2014 running MacOs Mojave