As the title states. Just downloaded the new version. After pairing my controller and opening InputMapper, nothing happens. I get the error please try connecting your device again. I'm now back on 1.5 which works perfectly.
Did you try connecting it again as the error states? You only get that box because something kept your controller from connecting exclusively and it had to run the exclusive mode tool in the background. Ensuring other programs such as uplay and similar are not running will keep this from happening.