I have a recently purchased (March 2013) copy of Revit LT 2013. When I open a client's Revit file - which was created on an older version of full-blown Revit - the file goes though a "one time upgrade" and is converted. I then immediately save the file. The program adds an "LT" to the file name to distinguish it from the original file.
When I go to reopen the LT file, I get an error message that the data is corrupted and must be "manually recovered" and "Contact Autodesk Support". There seems to be nothing on this issue in any of the Revit forums, and a Revit LT forum does not seem to exist yet.
Running on Windows 7 SP1 64 bit
Thanks in advance for any help offered.