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Sorry, this is not really a reply, but another ask for Autocad (Autodesk) to fix the problem. Seems nothing in all the www is able to predict, duplicate, nor prevent (fix) this problem.
It may be a simple issue on my part, but it happens way to frequently. For a company that charges so much for licensing, one would think they had the resources to fix these sorts of bugs (noticable from 2008 and on).