Selecting a high-poly mesh in the UV Editor would cause Maya 2018.5 to crash instantly (Exception_Access_Violation). The Official Fix: This was fixed in the Extension 3 for Maya 2018 . It was a memory address conflict when using polySubdivideFacet . The Workaround (Script): Run this Python script to force a cleanup before opening the UV editor:
I notice you mentioned — that version number doesn't exist. You likely mean one of these: autodesk maya 20185 fixed
as a "purely bugfix update," addressing several critical issues found in previous 2018 iterations. Key improvements included: CG Channel Stability Enhancements Selecting a high-poly mesh in the UV Editor