Hi,
With SyncToy 1.4, on "echo" pairs, when I had any doubt about the synchronisation (i.e. perhaps some files have been missed), I used to click "preview" while holding the "shift" key. This cleared the "pair memory" somewhere and ensured that SyncToy would synchronise thinking that it was the first time.
With SyncToy 2.0
(RTM included), when I preview while holding the "shift" key, I have an error message about the destination drive not being accessible and the pair
is definitively broken.

Thanks for all.
J-Luc Barraud