Upgrade from 2018 to 2019

[DevOma]

Never heard this issue before - the app is hosted on a Citrix environment? Can you check any other context menu is working? Like in Find-Window in the result list - or on a connection tab title - or in Overview-Window??? It is a general problem?

What is the difference to your user? Can you change it to see if the context menu come back? It must be something with your environment... but I've no idea what could cause blocking context menu