You receive the following error message when attempting to open Session Manager from ArcFM Viewer for ArcGIS Engine:
(ArcFM Session Manager
Session Manager's user interface is not suppored in ArcGIS
Engine on Windows 7.)
This issue is most likely related to the following bug resolved in ArcFM 9.3.1 SP2 and 10.0.1.
MM41100: Session manager not accessible from Viewer on Windows 7.
A patch is available for ArcFM 9.3.1 SP1.