https://forums.autodesk.com/t5/civil-3d-forum/isolate-corridor-region-in-source-removes-in-dref/m-p/12513709#M22818 <P>I was spinning my wheels trying to figure out why half my Dref corridor vanished from my section views this morning. Come to find out one of our staff had isolated a region in the source corridor, saved then closed out before un-isolating. Poof, un-isolated corridor sections vanish from Dref'd drawings. The cross-section models showed up in the group section properties, but the Draw check box was unchecked and could not be checked.&nbsp;</P> Mon, 22 Jan 2024 18:07:01 GMT RobertEVs 2024-01-22T18:07:01Z https://forums.autodesk.com/t5/civil-3d-forum/isolate-corridor-region-in-source-removes-in-dref/m-p/12513709#M22818 <P>I was spinning my wheels trying to figure out why half my Dref corridor vanished from my section views this morning. Come to find out one of our staff had isolated a region in the source corridor, saved then closed out before un-isolating. Poof, un-isolated corridor sections vanish from Dref'd drawings. The cross-section models showed up in the group section properties, but the Draw check box was unchecked and could not be checked.&nbsp;</P> Mon, 22 Jan 2024 18:07:01 GMT https://forums.autodesk.com/t5/civil-3d-forum/isolate-corridor-region-in-source-removes-in-dref/m-p/12513709#M22818 RobertEVs 2024-01-22T18:07:01Z https://forums.autodesk.com/t5/civil-3d-forum/isolate-corridor-region-in-source-removes-in-dref/m-p/12514329#M22819 <P>Nice catch and thanks for sharing. That's important to know.</P> Mon, 22 Jan 2024 22:44:18 GMT https://forums.autodesk.com/t5/civil-3d-forum/isolate-corridor-region-in-source-removes-in-dref/m-p/12514329#M22819 tcorey 2024-01-22T22:44:18Z