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Hi All, just wanted to thank everyone again for helping me so far in my lisp journey! As a token, I worked on a VS Code extension for AutoCAD snippets. This so it can allow users to type in quickly common functions the use all the time (e.g. search layer if dont exist create layer and so on). So far I have added the comment section. Happy to receive feedback and suggestions. Thank you https://marketplace.visualstudio.com/items?itemName=CivilTechSource.autocad-lisp-snippets

What are the computer specifications? What OS? Lines, LWPolylines, 2DPolylines or 3D Polylines I doubt there is a permanent fix except to repair the drawings that have the issue, though it could still be an issue with your computer graphics. If it's polylines, try exploding them to lines, then PEDIT them back to LWPolylines, also try an Audit on the affected drawings. You could post an example drawing that has the issue, maybe it will show on other's computers if it's a .dwg issue.

The OP is using AutoCAD LT 2026 and cannot use a .NET AFAIK. You are new so I removed your link to YouTube.

For me simplest and quickest is use a wipe out in the block, set to background then will auto obscure line underneath. Hopefully the result you want.