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TR closed. This issue cannot be reproduced with NoMachine 7 on Ubuntu 20.04 and CentOS 8.0. The problem is caused by old Gnome releases. It is therefore recommended to update your installation.
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When running an application in custom session-floating window mode, the key ALT+TAB keys, which should let the user change the focus of the windows open on the local desktop, gets blocked. The NoMachine floating window stays in the foreground.
This has been reproduced on CentOS and Ubuntu clients. Windows clients are not affected.