I have done more testing this morning and I think I know what is causing the Undo to fail.
I have narrowed it down to Associative Hatching that will cause the Undo to all of sudden list every mouse zoom as an Undo command and as soon as I take off the associative hatching then the Undo command will work and will combine all the mouse zooms into 1 undo command.
Could someone verify this and see if you get the same results.
Start a brand new drawing by using Autodesk Civil 3D template "_AutoCAD Civil 3D (Imperial) NCS.dwt" which is located under C:\Users\Your User Name\AppData\Local\Autodesk\C3D 2013\enu\Template.
Save the drawing before you do anything, then just drawn a couple of lines, then using your mouse middle button to zoom in and out, then go to the Undo icon pull down and you should only see a few undo commands. Now draw a rectangle and hatch it with Ansi 31 and do not make it associative hatch yet, once done save it, then using middle mouse scoll button again zoom in and out and then go back to the undo and again you should only have a few Undo commands.
Now let's see if we can break it, now select the existing hatch and make it associative hatch, now save the drawing, now just draw a line, check undo, now use middle mouse button to zoom in and out, now go back to the Undo and in my testing you should get a whole bunch of Undo commands.
I would also be curious if you take an existing drawing that you know you are having problems with and if it by chance has hatching in it select it and see if it's associative hatch and if it is turn it off and see if that fixes that drawing.
I have doubled and tripled checked everything and with all my testing I have concluded that Associative Hatching causes the Undo command to not combine all the zoom in's and out's into 1 Undo command like it suppose to.
So now if I can get other people to test this and reply back to this post then maybe Autodesk can get to work on it to solve this problem.
Correction, I meant to say Annotative versus Associative, so replace Annotative for the word Associative in my previous reply
Sorry about that.
I have been able to confirm on 3 different machines that the Undo command will fail if we have just 1 hatch that is set to annotative hatch and this only happens in Civil 3D 2013 SP2 and Civil 3D 2014 No service packs.
I have tested this also in Civil 3D 2012 SP3 and the Undo works fine and I couldn't break the undo by using annotative hatching at least with SP3.
I have also tested this with ADT & MEP 2013 & 2014 and the problem only exists with Civil 3D 2013 & 2014 and only if there is just 1 piece of annotative hatch within that drawing.
It doesn't matter if the HPAnnotative system variable it 0 (off), if there is 1 piece of hatch within that drawing that has annotative hatching turned on within a Civil 3D 2013 or 2014 drawing then the Undo doesn't work correctly.
I have been able to take the Civil 3D 2013 & 2014 drawings that have this problem and change every single piece of hatching and turn off the annotative hatching and the Undo will start working for that drawing jsut like it's suppose to.
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