Shape tools lagging and leaving mark when resizing
I just started using Illustrator CC 2018 on Windows 7. I began using some of the shape tools and started to experience an issue. Each time I go to resize a shape or move it, the shape leaves an impression of its previous size or location. I tried to uninstall Illustrator and then reinstall, yet the problem persists. If I minimize or maximize the art board the lines go away. I have also found that the smart guides don't work when re positioning the shapes.
Please accept my sincere apology for the inconvenience. 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.
Thanks & Regards,