I found this in the log.

Date3/8/2013 8:16:52 AM

LogWindows NT (Red Gate Software)

SourceSQL Doc 2

Category(0)

Event32

ComputerMYPC

Message

CommandLine

Main:Unhandled Exception

System.ArgumentNullException: Value cannot be null.

Parameter name: value

at System.IO.Directory.SetCurrentDirectory(String path)

at System.Environment.set_CurrentDirectory(String value)

at RedGate.SQLDoc.Engine.Project.Project.(String )

at RedGate.SQLDoc.Engine.Project.Project.set_FilePathOfHtml(String value)

at RedGate.SQLDoc.Engine.Project.Project..ctor()

at RedGate.SQLDoc.Engine.Project.Project.LoadFromDisk(String pathAndFileName)

at RedGate.SQLDoc.UI.CommandProcessor.RunProject()

at RedGate.SQLDoc.UI.CommandProcessor.Run()

at RedGate.SQLDoc.UI.Program.Main(String[] args)