Minimwatch unable to perform rescan

[Alandbush]

You appear to have run through the whole gamut of software and hardware possibilities, with perhaps one exception.

Have you checked the validity of the recently copied audio files?

To investigate further, if so inclined, MinimWatch and MinimServer do produce log files with granularity from Info upto Trace. Both log file properties and contents are available from the MinimWatch system tray icon.