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Hi all,
I've experienced this in both Civil 3D 2016 and 2019. When a target (whether horizontal or vertical) is selected for an assembly, the corridor doesn't follow the selected target consistently. This results in the corridor jumping between having a target and not having one.
In my case (please see screenshots below), I'm trying to target a ditch profile (blue line in profile) and the jumping green line is the resultant corridor feature line of the ditch bottom edge.
I would suggest that the problem arises when the subassembly cannot find the target. It would be difficult to know without having a dwg file.
Bill
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