When using the Library Browser and I attempt to make a drawing a 'favorite'in the browser it opens the 'Qt Script Debugger' and shows the following message: Uncaught exception at C:/Program Files/QCAD Professional/scripts/Tools/LibraryBrowser\db/DirectoryPeer.js:209: TypeError: Result of expression 'source' [undefined] is not an object.

A similar error happened every time I would try and open the Library Browser. I uninstalled and re installed but it didn't fix it. I followed the advice in one of the forums on how to reset to default configuration and this seemed to fix it.