Many users take advantage of the newly introduced "page rotate" feature in Autodesk Design Review 2009.
However, some noticed that the same file, once rotated in Autodesk Design Review 2009 and saved, does not open correct when attempting to open it using Autodesk Design Review 2008 instead.
First and foremost, this feature is - at this point - not backward compatible, and files can only be expected to display correctly once the user sticks with Autodesk Design Review 2009.
That said, one would expect that the earlier version, Autodesk Design Review 2008, shows a message of some form or another. I believe that our design team is now working on the same.
Here are steps for those of you that are interested to duplicate the issue:
1. Open a 2D DWF file (or image) in Autodesk Design Review 2009.
2. Rotate the 2D sheet clockwise or counter clockwise.
3. Save and close.
4. Open this saved file using Autodesk Design Review 2008.
Result: Autodesk Design Review 2008 opens the rotated sheet without message, and the view is not correct, with contents separated by a sheet page.