I have never noticed this before so I think it is a new behavior. In XP Pro, when Dcupdater auto-installs a new version of FARR, FARR immediately restarts when the installation is complete. On my notebook, running Vista Ultimate, it has always done the same as far as I can remember. But after the installation of 2.24.01 it did not; I had to start FARR manually from the Start>All Programs menu.
Must be an issue in Vista because after the XP Pro installation via Dcupdater FARR restarted itself.