vncserver application windows turn black when clicked

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chankim
Posts: 50
Joined: 2015/07/15 12:05:39

vncserver application windows turn black when clicked

Post by chankim » 2018/03/19 09:05:39

Hi, I'm using a machine using CentOS 7. I'm not the admin but can do sudo.
This morning, there were some problems of not having the menu in the GUI window, but I fixed it by fixing xstartup file
and adding PAMName=login in the /etc/sysconfig/system/vncserver@4.service file and doing
sudo systemctl daemon-reload, and sudo systemctl restart vncserver@:4.
Ok, the menu is there and I can use the menu to start terminal, web browser, etc.
Some times later, suddenly the application windows all turned black. I started vncconfig on the terminal(just typed the command in the blank window), and I can see vncconfig window. If I click vncconfig window, it becomes black and other windows (terminal and web browers) comes back to normal. If I click a terminal, the terminal and the web browser is turned black and vncconfig windows comes to normal. So whatever window I click, it becomes black. What can be wrong? Sometimes, only the window I click becomes black. (sometimes all the windows except vncconfig window).

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