the issue has been resolved by Appple in macOSX 10.13.4
Please upgrade to resolve the issueBrian Borders commented
Just read update which I overlooked previously. Switched color mode to CMYK. Works, lots fine now.Brian Borders commented
Vector Shapes Splitting, Cracking Up. Zoom in, zoom out—it changes but only morphs. Happens when drawing (or just viewing) with Ai 2018 CC.
MacBook Pro 13", 10.13.3
Graphics: Intel Iris Graphics 550 1536 MB
Processor: 2.9 GHz Intel Core i5