This discovery was really helpful to me. I would add that you have an option to disable BTT for a specific application. You add Parallels as an application to the BTT app list and then there is a drop down with options including disable BTT. Once I did that, the Parallels right click now works. HTH.
*edit* The above fix (disabling in BTT) is not working reliably for me. I have added the Parallels Win 10 dock helper and also the specific app involved in hopes it works better but not yet sure. May not be as useful a workaround as I had hoped.
Last edited: Aug 20, 2018