The Repository Viewer under certain circumstances may become unresponsive. Closing and opening the Repository Viewer does not resolve the issue as the application attempts to return to the location you were attempting to view previously.
Corrupt or invalid location in the specified path. Usage of MMC functionality not intended for use with Repository Viewer.
1) On the machine running Repository Viewer ensure the Repository Viewer is closed.
2) Navigate to C:\Documents and Settings\%UserID%\Application Data\Microsoft\MMC.
3) Locate the file itrv. Backup this file to alternate location and delete the existing file.
4) Open Repository Viewer. Should resolve to the default Select Repository screen.