Hi,I'm having some trouble with AutoCAD 2013. I've been running it for over a yr now with no problems but recently something weird seems to of gone wrong with it.If I draw up 2 components on separate layers, join all polylines, group all parts of the component before layering one components over the other some of the lines (not all) on the component will join. This means if I select and move one of the components it will drag a point or polyline from the other component with it.I hope this is making sense.Even if I turn one layer off, pick and move the current layer then turn the 2nd layer back on some of the lines from the previously turned off layer will be dragged and connected to the first component.Never seen this before, never had an issue with this before and cant see any practical reason why anyone would need CAD to do this. Have I altered my setting somewhere? I cant see anything that has changed. Any help would be much appreciated as this is driving me mad!!!

I think I know what you may have done wrong but I cannot be 100% certain without seeing a copy of the actual DWG file.BTW...I did a quick test where a drew a square on layer 0 then on another layer drew the same size square right over the top of the first one.  I turned off layer 0 then moved the square on the second layer.  Then I turned layer 0 on.  Guess what?  None of the four lines making up the first square moved.  That's the way it has always worked and continues to do so even today.
John Connor2014-12-03 12:16:38