window (title and icon) sometimes doesn't appear. As a solution to this, I have to logout and login again. Is there something wrong with my system? How to make sure that this doesn't happen again?
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You can try couple of things:
Hit Alt+F2 and run:
Please note that this will "reset profile parameters in compiz and restart the Unity shell with default settings." That is to say, you may lose some of your customizations (if you've made any), including to the notification area.
However, this is still much safer than CCSM (described below), and it is a good idea to reset Unity before implementing a CCSM-based solution.
CompizConfig Settings Manager
Install CCSM (If you don't already have it) by running following command in terminal
sudo apt-get install compizconfig-settings-manager
Open it by searching "CCSM" in Unity dash.
Once open, Click on the "Effects" category and make sure that "Window Decoration" is enabled.
When window borders are missing you can still perform some basic functions like, minimise, maximise and move. Press and hold Alt and right click on the window.