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		I too have the same problem; however, mine is horizontal.  The only way to get rid of it is by not using it and removing it from your software. I hope someone has a better solution than mine.
	
	
	
	
	
 
 
	
	
	
		
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		06-23-2019, 11:58 PM 
(This post was last modified: 06-24-2019, 12:33 AM by Mart.)
		
	 
	
		
I believe it's a compositor issue.
Go to - Settings Manager - Window Manager Tweaks - Compositor - Uncheck 'Show shadows under dock windows' .
See link below which illustrates the solution:-
https://arcolinuxd.com/how-to-remove-the...k-on-xfce/
Hope this helps.
	
 
	
	
Still running 3.8 and lovin' it  (running 5.0 as a triple boot)
	
	
 
 
	
	
	
		
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		I really don't see any practical difference between a dock and a good ol' Xfce panel with launchers.  I admit Cairo dock is pretty, but why add more and more stuffs that all do the same thing?  I think one app for one task is slimmer and faster.  Keep Linux Lite Lite!
	
	
	
	
	
 
 
	
	
	
		
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		 8)  Mart: Thanks for the Hyper-link on fixing a shadow on OS. 
       If it happens again I will know what to look for. 
      Assume  
 
	
launchpad.net <- 
debian.org <-
GitHub.com <-
kde.org <-
I stay busy with LINUX, 
Together we are LINUX...!
	
	
 
 
	
	
	
		
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		06-24-2019, 04:57 PM 
(This post was last modified: 06-24-2019, 05:45 PM by Mart.)
		
	 
	
		bernard stafford
I'm glad it helped. I had the same 'shadow' problem when using Plank dock in the past.
But I had to stop using Plank due to some screen burn issues around the icons.
Reverted back to a Xfce panel with launchers, as Artim mentioned.
Xfce panel is not as much fun as Plank dock but it does the job all the same.  
 
![[Image: V4N3olZ.png]](https://i.imgur.com/V4N3olZ.png) 
	
Still running 3.8 and lovin' it  (running 5.0 as a triple boot)