Shown window-border while running xfce

[Enzo]

When I start Plank I have the graphic bug below...I tried to change the theme , to check the boxes to hide the bar but nothing changes ... I tried both with the nouveau driver is with the owners nvidia.
This is my conf:

Plank 0.8.1.1184
Ubuntu minimal with XFCE 4.10.1
xfwm4 4.11.3
Video Card Nvidia 8800gt 512MB
Xorg 1.15.1

My output is:

[INFO 14:41:05.312425] [AbstractMain:243] Plank version: 0.8.1.1184
[INFO 14:41:05.312493] [AbstractMain:244] Kernel version: 3.13.0-46-generic
[INFO 14:41:05.312541] [AbstractMain:245] GLib version: 2.40.2
[INFO 14:41:05.312595] [AbstractMain:246] GTK+ version: 3.10.8
[INFO 14:41:05.312642] [AbstractMain:247] Wnck version: 3.14.0
[INFO 14:41:05.312698] [AbstractMain:248] Cairo version: 1.13.1
[INFO 14:41:05.312749] [AbstractMain:249] Pango version: 1.36.3
[INFO 14:41:05.312795] [AbstractMain:251] + Gtk+ CSD support enabled
[INFO 14:41:05.312840] [AbstractMain:254] + Cairo/Gtk+ HiDPI support enabled
[INFO 14:41:05.312886] [AbstractMain:257] + Dynamic Quicklists support enabled
[INFO 14:41:05.312931] [AbstractMain:260] + XInput Barriers support enabled
[INFO 14:41:05.327228] [WindowControl:66] Window-manager: Xfwm4
[DEBUG 14:41:05.333440] [Preferences:328] Loading preferences from file '/home/enzo/.config/plank/dock1/settings'
[WARN 14:41:05.385827] [Preferences:184] '/usr/share/plank/themes/Transparent/dock.theme' is read-only!
[DEBUG 14:41:05.385912] [Preferences:328] Loading preferences from file '/usr/share/plank/themes/Transparent/dock.theme'
[WARN 14:41:05.386090] [Preferences:344] Missing key 'OuterStrokeColor' for group 'PlankDrawingTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386171] [Preferences:344] Missing key 'FillStartColor' for group 'PlankDrawingTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386251] [Preferences:344] Missing key 'FillEndColor' for group 'PlankDrawingTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386330] [Preferences:344] Missing key 'InnerStrokeColor' for group 'PlankDrawingTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386409] [Preferences:344] Missing key 'HorizPadding' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386517] [Preferences:344] Missing key 'ItemPadding' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386596] [Preferences:344] Missing key 'IndicatorSize' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386675] [Preferences:344] Missing key 'IconShadowSize' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386753] [Preferences:344] Missing key 'UrgentBounceHeight' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386832] [Preferences:344] Missing key 'LaunchBounceHeight' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386911] [Preferences:344] Missing key 'FadeOpacity' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.386989] [Preferences:344] Missing key 'ClickTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387067] [Preferences:344] Missing key 'UrgentBounceTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387145] [Preferences:344] Missing key 'LaunchBounceTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387223] [Preferences:344] Missing key 'ActiveTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387302] [Preferences:344] Missing key 'SlideTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387381] [Preferences:344] Missing key 'FadeTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387459] [Preferences:344] Missing key 'HideTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387538] [Preferences:344] Missing key 'GlowSize' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387616] [Preferences:344] Missing key 'GlowTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387691] [Preferences:344] Missing key 'GlowPulseTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387766] [Preferences:344] Missing key 'UrgentHueShift' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[WARN 14:41:05.387842] [Preferences:344] Missing key 'ItemMoveTime' for group 'PlankDrawingDockTheme' in preferences file '/usr/share/plank/themes/Transparent/dock.theme' - using default value
[DEBUG 14:41:05.389847] [ApplicationDockItemProvider:76] Unity: Initalizing LauncherEntry support
[DEBUG 14:41:05.390183] [ItemFactory:155] Loading dock items from '/home/enzo/.config/plank/dock1/launchers'
[DEBUG 14:41:05.390928] [Preferences:328] Loading preferences from file '/home/enzo/.config/plank/dock1/launchers/xfce4-terminal.dockitem'
[DEBUG 14:41:05.391997] [Preferences:328] Loading preferences from file '/home/enzo/.config/plank/dock1/launchers/chromium-browser.dockitem'
[DEBUG 14:41:05.393142] [Preferences:328] Loading preferences from file '/home/enzo/.config/plank/dock1/launchers/plank.dockitem'
[DEBUG 14:41:05.393764] [Preferences:328] Loading preferences from file '/home/enzo/.config/plank/dock1/launchers/xfcalendar.dockitem'
[DEBUG 14:41:05.394421] [Preferences:328] Loading preferences from file '/home/enzo/.config/plank/dock1/launchers/ghb.dockitem'
[DEBUG 14:41:05.395039] [Preferences:328] Loading preferences from file '/home/enzo/.config/plank/dock1/launchers/vlc.dockitem'
[INFO 14:41:05.439981] [HideManager:566] Barriers enabled (XInput 2.3 support)
[DEBUG 14:41:05.448249] [ApplicationDockItemProvider:163] Unity: com.canonical.Unity acquired
[DEBUG 14:41:05.454727] [DockWindow:298] dock window loaded

Thanks!

[Rico Tzschichholz (ricotz)]

Follow solution on https://answers.launchpad.net/plank/+question/262027

[Rico Tzschichholz (ricotz)]

Just go to 'Setting > Window manager Tweaks > Compositor' and uncheck 'Show shadows under dock windows'.