Selecting Object In The AutoCAD 2012?

I created two lines.

Before this problem appears, if I select one line then another line one-by-one, they are all selected.

But now, when I select one line then another line one-by-one, only last one is highlighted as selected (dashed line, two blue endpoints, and one blue middlepoint), the other one is not.

How do I switch back to the previous one?

Thank you

Set your PICKADD variable to the setting which you prefer after referencing the system variable options.

You probably want PICKADD set to 1.

or go design centre and click the + or 1 icon up the top?

or hold ctrl and select more stuff

(ctrl and click will de-selct selected objects ....can be handy to get familiar with methods of selection until it becomes second nature (inc selection boxes going right and left))

Dadgad = king of the system variable.

I didn't do anything to set the variable.

Why it changed automatically?

I didn't do anything to set the variable.

 

Why it changed automatically?

Hopefully, you are not one of those people that can't resist clicking the buttons on the top of the properties dialog, there is a toggle button up there for pickadd. It changes it back and forth from 1 to 0, an irritating little button it is, indeed.

Do you use LSP programs? some of them might have to reset pickadd to 0 in order to make the code simpler, and again some poorly written lsp programs don't reset anything to the original values when they are done.