Due to user response, we added +10dB to the input signal in the 3.5.1 update. Steven was using version 3.5, so the results will be different at the same settings. Simply reduce the INPUT gain by -10dB to match.
I'll pass the mono/stereo issue on to support to see what they say. It would be helpful to know what DAW you are using, computing platform, etc.
Also exactly how you set up these mono and stereo tracks.