Interesting note, the current build of SDC is build 163. Yet the history.txt (accessed by going to Help > History in SDC) has an entry for build 164 which reads "Added manifest to make sure SDC requests admin rights when running with UAC on Vista" and "Fix for an upgrade issue with x64 Vista". The interesting part is that the major version (2.51.512) matches the current build 163 which we're using, not the build 164 that... well, we're not.
Are we using the version with the manifest added, or not?