duplicate and align with option and shift doesn't function in Illustrator 2018
Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
I used to duplicate an object by selecting it, push the option-button and drag the object. That still functions. BUT ... during dragging a duplicate I also pressed the shift-button to align the duplicate with the original. And that doesn't function anymore. When I now press the shift-button, while dragging, the object aligns but doesn't duplicate. So pressing the shift deactivate the option.
Hope its clear now.