I regularly get the gnome-session "A program is still running" dialog when I log out, and it lists gnome-power-manager as not responding.
Fixed in svn a few days ago, thanks.
* Tue Apr 21 2009 Richard Hughes <rhughes> - 2.26.1-1 - Update to 2.26.1 - Fix the low capacity warning to fix rh#489832 - Backport DPMS and IDLETIME fixes from master to fix multiple bugs - Connect to gnome-session and exit on logout - Remove upstreamed patches