HELP - windows disappear completely when minimized

From	Richard Owlett <rowlett@cloud85.net>
Newsgroups	linux.debian.user
Subject	HELP - windows disappear completely when minimized
Date	2017-03-04 12:40 +0100
Message-ID	<thgcx-8v3-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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ENVIRONMENT:
I am using Jessie (8.6.0) with MATE installed from purchased DVD set.
The problem is associated with a single user. This was verified two 
ways. Logged in as root, there is no problem. Created a new user and 
then logged in to that user, no problem.

PROBLEM:
In normal operation, for each application launched its window opens and 
a title appears in the lower panel. These "titles" are ordered left to 
right in the panel.  When several are open, clicking a title brings that 
application to the foreground. When an application is minimized an 
animation of a shrinking box moves from the app to its associated title.

In this ABNORMAL situation:
When an application is opened, no title appears in the lower panel.
When it is minimized, the animated box shrinks and disappears past the 
right end of the lower panel.

I strongly suspect "operator error".
What did I do?
How do I recover?
TIA

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HELP - windows disappear completely when minimized Richard Owlett <rowlett@cloud85.net> - 2017-03-04 12:40 +0100
  FIXED [Re: HELP - windows disappear completely when minimized] Richard Owlett <rowlett@cloud85.net> - 2017-03-04 14:00 +0100
    Re: FIXED [Re: HELP - windows disappear completely when minimized] Cindy-Sue Causey <butterflybytes@gmail.com> - 2017-03-04 18:20 +0100

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