Hi Paul, this is probably way too late for you, but I've just discovered that the cause for us having the exact same issue is installing AutoCAD 2006 (32bit) either before or after having V8i installed. This was for Win7 64 bit, Office 64bit, AutoPLANT V8i SS3 with AutoCAD 2010. Unistalling AutoCAD 2006 and repairing AutoPLANT after did not reverse the issue .
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