I'm having the same issue. I installed Mojave 10.14 (iOS 10.14 Mac) and immediately after the Adobe update with Illustrator CC 23.0 A DISASTER! Despite the 64 GB RAM of the new iMacPro, Illustrator every few minutes passes ALONE in "Contour" mode and no allows to return to "Preview" mode with message "Unable to complete preview" At that point I must immediately save and exit the program (quit) and re-enter to prevent it from crashing and losing data. Message: Not enough RAM ... 64Gb are installed on new iMac Pro So it's very difficult to work
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