Not sure if you need to do this every time.
Logout and log back in (or reboot) and check if things are correctly loaded.
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You were right, I even restarted os and can see background and close opened apps.
Thank you all for your help.
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Nice! Glad it worked out! 
did you restart after update ? before report problem
EDit . guess never find out 
can reproduce ( terminal freeze ) not wallpaper problem .
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yes, many times!
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