I updated this morning and have been experiencing the same thing. very frustrating

Illustrator keeps crashing with simple things and photoshop too.
Animated zoom (GPU Preview) keeps on failing.

Same problem. It takes a little bit longer but happens in the middle of work, have to save and restart. Annoying when I have a print deadline.

Twice v23.0 crashed when selecting layers, alert window approx says "Cannot perform preview" then my artboard disappears. I save to be safe, quit, then re-open same file. Artboard with sketch is visible but in CPU Preview. I never selected Preview on CPU or hotkey.

help, this is frustrating!

Same is happening for me in Windows 10. I rolled back to v22.1

As far as I can tell, yes. Rolling back to 2018 is the solution to this mess for the time being.

If i uninstall the 2019 version to work in the 2018 version. Did my illustrator document will on open ( file saved in 2019 -- open in 2018 ?? )

I had enough and rolled back. Was able to open files saved with 2019. Whew.

I've reverted to 2018, but now any file I've worked on with Illustrator 2019 is broken... grouping is all FUBAR and issues galore. DO NOT UPGRADE TO ILLUSTRATOR 2019 UNTIL THIS IS FIXED. And if you did like I did, I'd like you to attempt cursing louder than I am right now. This is a total fail Adobe.

JUST LEAVE THE PROGRAMS ALONE, EVERYTHING WORKED FINE NOW EVERYTHING CRASHES AND IS BACKWARDS. WHAT IS WRONG WITH YOU ADOBE?

This little beauty of an issue makes Illustrator CC 2019 dysfunctional on my Mac.

If i uninstall the 2019 version to work in the 2018 version. Did my illustrator document will on open ( file saved in 2019 -- open in 2018 ?? )

Same problem. What the ****, man.

I'm running Mojave and the problem is happening here also. Started immediately after the upgrade. I've saved a number of files in cc 2019 format that I assume I can't open in 2018?

Had the same issue immediately after upgrading. Also get the not enough RAM dialogue box as well. I have also had issues with trying overprint preview. One time I had a file with 2 spot colors, it told me I couldn't use overprint preview because there were over 27 spot colors...

I wasn't able to find a workaround so I went back to V22.1 (March 2018 update). To go to previous version: Go into Creative Cloud. Next to illustrator there is a button that says open with an arrow to the right. Click the arrow then click manage > other versions. Install v22.1. Then you can uninstall the 2019 version (V23).

I am upgrading my Mac to Mojave to see if it fixes anything.

I'm having the same issue.

I am having the same problem with my brand new iMac Pro... I had this bug since updating to the new CC19

Same issue on MacOs Mojave 10.14. It did progressively get worse. Had to go back to the previous version. Please fix this issue soon. Need to stay up-to-date in my office.

Updated this morning I have the same issue I'm on windows 10 system. Was working fine before the update.