It appears to me that the installer is setting the DDE Server name in the registry to 'AcroviewR10' instead of the 'AcroviewR11'.
I confirmed by upgrading from Reader 9.5.x (DDE == Acroview) to Reader 11 (as of Oct 22, 2012) and the new value in the registry (XP and 7) was AcroviewR10.
I know there was a similiar issue when Reader 10 was released. Is there any idea when an update might come out that will fix this? I hate having to give customer's .reg files to fix these issues.
I understand that you are new to updating this variable every release, and so it isn't a part of your checklist yet, but it would be highly appreciated if you could remember that for version 12.