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When opening the software you get an error message that says "System.NullReferenceException: "Object reference not set to an instance of an object." and the software closes.
The library.config file becomes corrupt
Make sure the software is closed and browse to "C:\Documents and Settings\(user name)\Application Data\Bentley\EngineeringLibraries\" (for Windows XP) or "C:\Users\(user name)\AppData\Roaming\Bentley\EngineeringLibraries
Locate the "libraries.config" and "libraries.config.bak" file and delete them
Reopen the software