This issue has been happening for a while for me, but I kind of chalked it up to something weird on my system. I have since experienced it on a a second system and also after rebuilding current system from Win7 to Win10 so I figured I would see if anyone else is experiencing it.
Seemingly at random times, when I am interacting with an RDP session in a tab, when I click the mouse, it will bring forward a windows that was open behind RoyalTS. Like a messenger window or Outlook. Its like the Royal TS window was transparent and the click went through it and registers on the application in the background.
we have heard of issues like this from a small number of users but we weren't able to pin it down. We suspect that some other tool is interfering with Royal TS and some Windows-Message get's mixed up somehow. We asked other users to try to repro the issue on a vanilla machine but haven't heard back from them. Are you able to repro the issue on a new machine? Can you think of any tool/software/driver which might interfere?