Hi,
sorry, it's again not clear what you mean/you try to do exactly.
My understanding if "snap to viewport" (from your title) is that you can't draw a line to an endpoint of the corner or perpendicular to an edge of the viewport.
For me that is working well.
When I select a viewport from an old drawing or a viewport that is created using command -VPORTS I also get the grip points of that vport corners.
And yes, AutoCAD 2018 update 1 has an improvement for viewports created based on views (command _MVIEW), but also these viewports have grips on the corners as well as can be used with object snap end, int, per, ...
Can you please show/record your situation using Autodesk screencast (>>>click<<<), just to show us what you are exactly doing...
Also try that with a new drawing, just to make sure it's not specific to just one file.
- alfred -
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Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ...
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CDay 2024------------------------------------------------------------------------------------
(not an Autodesk consultant)