I have the same issue. My observations, hope this helps: - It happens randomly but often, about once per 10 minutes of work. - I control my Windows PC from either another windows PC or a MAC, happens in both contexts. - If the Shift key gets stuck, it cannot be unstuck, only by closing the session and rejoining. - Once TV is in this fault state, the scroll wheel of my mouse also stops working. - Using latest TV13, reinstalled today 6 jul 2018. - Seems unrelated to hardware, my mouse and keyboard are wired USB or built in (macbook pro) - Problem also observed controlling a PC over the internet (not LAN related) - Problem does not seem to occur when controlling a remote Mac from a Windows PC. - Pretty sure that the problem was introduced in one of the later versions, did not happen more than a year ago. Sorry for the imprecise description. Again, hope this helps.
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