I have been noticing that when I return to work on a file, that objects that I had previously drawn or altered are missing. At first I thought that I had mistakenly saved an older version of the file over the current one. However this has happened several times, and I am not typically that careless. This evening It began to happen while I was in the middle of a drawing. I would zoom back out after working on a particular area, and find that the wall I had drawn just a moment ago was gone, and another object was reverted to an earlier state. Has anyone else had this experience/ know what could be going on?
I have not experienced this personally but a colleage had this issue (he thought he was going mad!!) Autodesk recommended service packs/hotfix (sorry cant remember which) that seemed to sovle the problem.
If you have these installed already I dont know the answer!