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Created attachment 418473 [details]
A picture showing the artifacts on the top and bottom panels.

Description of problem:
Gnome panel shows artifacts when background style is semi-transparent

Version-Release number of selected component (if applicable):
2.28.0

How reproducible:
Happens every time.

Steps to Reproduce:
1. Right click panel and select Properties
2. Click on Background tab
3. Select Solid color radio button
4. Adjust Style slider
  
Actual results:
The far left and right parts of the panel becomes semi-transparent and artifacts appear in the middle of the panel.

Expected results:
No artifacts should appear on the panel and the whole panel should become semi-transparent

*** This bug has been marked as a duplicate of bug 589956 ***