7.9 Scan - Playlists not found, deleted. Then found again and added

Just upgraded my LMS to 7.9.0 - 1422454553 and I find that now when I run a “new and changed” scan, it claims it can’t find my playlists on disk, and so deletes them from the DB – then when it gets to the” find new playlists” stage of the scan, it finds them again and adds them back in.

Really odd behaviour – especially as my Library is on a separate NAS server to LMS so therefore hasn’t changed at all, only the LMS server has changed

Any ideas?

Example Scanner Log says
[15-02-18 11:00:52.3262] Slim::Utils::Scanner::Local::deleted (783) Handling deleted playlist file:///mnt/samba/MUSIC/xxPLAYLISTS/playlist123.m3u
[15-02-18 11:01:13.4157] Slim::Utils::Scanner::Local::new (872) Handling new playlist file:///mnt/samba/MUSIC/xxPLAYLISTS/playlist123.m3u