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Trouble report closed. This issue is not reproduced in version 8.5.3, it is recommended to upgrade NoMachine installation.

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The issue occurs with two Windows computers. It has also been reproduced in a Linux virtual desktop session between a Windows and Xubuntu 20.04.

When NoMachine is used to connect to the server (A) from the client (B) and then NoMachine player is minimized hitting Ctrl+Alt+M,  Ctrl and Alt keys are left stuck in the pressed-down state. When focus is back to the NoMachine window, interacting with server A could produce weird results.

For example, when trying to scroll up/down with mouse wheel in browser,  you get zoom in/zoom out. Letters in keyboard do not work as letters, but instead they behave like with Ctrl key pressed ("n" becomes "Ctrl+N" that means "new window" for some applications).

Pressing Ctrl and Alt once would restore the state of those keys to the proper value.