Unfortunately there are no error logs. You will have to try downloading the source and putting in some breakpoints.
The tool does a 2-pass scripting run - firstly to script all objects to disk, and then to build the dependency tree.
If the scripts are on disk, then chances are it is failing in the dependency tree code.
Try some breakpoints in the following places:
DBSourceToolsLib.SysObjects.SysObjects.cs => void LoadFromDB( EventHandler<ProgressEventArgs> localHandler)
or maybe here:
DBSourceToolsLib.SysObjects.SODependencyTree.cs => LoadFromDatabase( EventHandler<ProgressEventArgs> localHandler)
Let me know what you find.