I am having a problem with moving a line that is attached at a corner to another, as it moves that line as if I clicked on the intersecting snap point at the end of both lines and dragged it. I want to move or copy the line away, but it somehow is attached to the other, and is quite annoying and impossible to work with without deleting and redrawing lines. I've tried exploding them, but they are not joined in that way, and are not "grouped" (I don't think, because when I did "group" them, it made a box around them and highlighted both lines at the same time). A symbol shows that is two boxes, one an outline and the other solid which is up and to the right. I can't figure out what mode it is in to turn it off! Does anybody know, thanks!
In ACA there are two most probable causes.
1) The constraint system (enable the parameters tab and show all constraints). Constraints are ways to link non-AEC objects with each other. It is possible you have turned the constraintinfer on.
2) The anchoring system (object anchor is most likely). This creates relationships between objects. When objects are anchored, if you move the anchored object it will remain on the object it is anchored to. When you move the object to which other objects are anchored, those object move with it. Click on the object and look in the properties palette to see if it has anchor associated with it.
Exploding only works on blocks and mvblocks and is usually a bad idea in ACA.
You can use the DELCONSTRAINT command to delete the constraints already applied to objects in your drawing file.
Set CONSTRAINTINFER to 0 to turn off the inference of constraints as you draw. That system variable is stored in the registry, so you only need to do it once (per user, per profile, per computer) and it will affect all drawings.