I've done some additional testing, and the problem appears to be resolved once I manually create files in the install directory, and then select those files in the UI. I was not successful specifying file names from the UI, although I only put in a filename - not a fully qualified path and filename. Once the created file has been selected, changes made and saved via the UI appear to all be saved. Thus I believe that the problem lies in (1) not having a file - one is not automatically created as the text on the dialogue suggests, and (2) creation of a file doesn't work in the obvious way - perhaps the process should be changed to only create / look in the install directory?

Hope that this is useful.

Tx,

Robert