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I am running Lubuntu 11.10 (LXDE based on Ubuntu 11.10). A few days ago, I installed the Macbuntu, but it isn't compatible with LXDE and so, I uninstalled it. And today I installed Compiz (I have tried to install Compiz in Lubuntu 11.10 before and everything goes well at that time). I tried to run Compiz with the command compiz --replace and everything seems ok. But after a short time (usually within three minutes), the title bar and taskbar disappeared suddenly, and I cannot open any program with the hot key (e.g. I usually open the terminal with Ctrl+Alt+T, but it doesn't work at that time).

I can do nothing but kill the Xorg and stop the Compiz in tty1. Now the system is fine without Compiz. But when I try to run Compiz, the horrible thing will happen again. and I noticed that, usually when I close a window, or change the configuration of Compiz, the title bar would disappear suddenly. I really don't know how I can fix it. Can anyone give a hand to me?

Another: i have run gtk-window-decorator --replace to start the window decoration, i got the error:

Failed to load theme "Ambiance": Failed to find a valid file for theme Ambiance

(gtk-window-decorator:3994): Wnck-WARNING **: Unhandled action type _OB_WM_ACTION_UNDECORATE
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I have that problem too but when I press Ctrl+Alt+Del and log out and then log back in, everything goes right. The title bar disappears only when I change my desktops. How many desktops do you have in Compiz general settings? – geoh Feb 16 '12 at 10:01
possible duplicate of Enabling Compiz Disables Windows Title Bar - Why? – jokerdino Feb 16 '12 at 10:22
i have looked through the question you referred to. but nothing help. @jokerdino – Searene Feb 16 '12 at 10:41
up vote 0 down vote accepted

maybe it has some connection with some animation adds-on, such as beam, when open those special effects, compiz will crash. though i didnt know why

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Try emerald it may help you – Tachyons Feb 17 '12 at 1:04
thx, i have installed it. now everything goes fine without such crash animation(e.g. beam .etc), just leave it at that :) – Searene Feb 17 '12 at 2:59
@MarkZar - please add what you have done as an answer and accept it by clicking that tick button so that the question can be closed. thanks. – fossfreedom Feb 17 '12 at 14:14

Try to run compiz setting manager than(you can run it from terminal typing ccsm). Than enable than disable Windows Decoration than restart your computer.

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The way I managed to fix this was to get in the compiz setings manager and put put to default all the options for the Windows Decoration, the command line got updated. I then rebooted and it seems to have fixed the issue.

The symtoms for me were: Windows Decoration dispparearing every time I did a minimize and restore.

I'm running Ubuntu though, I don't know if that'll fix your case. I had a similar issue in the pass which running "gtk-window-decorator --replace" at start up fixed.

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