It's probably better that you inspect the files in post 9. They were created in V2013 to demonstrate the problem and have never been used in any other assembly.
No. I went off subscription and have no way of following up with my old VAR, but I tested it in 2014, same result.
I also posted a similar problem here http://forums.autodesk.com/t5/Inventor-General/How
I tested the same scenario in Solidworks. Not only does it update as it should, but I can delete a base sketch line, replace it with a spline, and it still updates fine. A video of that was sent to the VAR. No idea if they sent it to autodesk or not because they did not reply to that email.
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