We also noticed the righ channel loss. What is strange that it olny occurs in Steinberg's products so it looks like a Steinberg's bug in the latest versions of their hosts.
We plan an update of the MasterQ on 5th of January.
Refering to draggable handles on the graph. I still think that especially for mastering purposes our afforts to get the best quality are more important then additional control possibility. This does not mean that we are against this idea, we just chose to focus on the quality for the first version of this plug-in.
Regards,
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Mateusz Wozniak
PSPaudioware.com