I'm having a similar issue now. No matter what AutoCAD I use, (Civil 3D, LT, ACAD, 2013 or 2012) the sheet sets open blank. If I add properties or add drawings, then the good sheet set is overwritten with my empty one. I screwed up a project this way. Fortunately it was young, with only a couple dozen sheets and we were able to remake a new sheet set. But, I need to know how to fix this. I read in other posts that it was due to installing previous revisions of Civil 3D. I've not done that, but I did use Civil 3D 2012 to insert a Google Earth image and Surface for the first time in a long time yesterday before this problem showed up. Coincidence or Cause? I doubt it was the cause, but who knows? I submitted a ticket to Autodesk about it a few minutes ago. It may be worth noting that even when I've opened several Sheet Sets (all appear blank) there is not the usual list of open sheet sets in the drop down of the SSM.
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