On a new installation of Debian Wheezy with Trinity 3.5.13.2, taskbar 
seems to be seeing double.Every open window has two "windows" in 
taskbar.  Since teh Desktop I am setting up has a fairly narrow panel 
this rapidly becomes very confusing.

Has anyone any idea how I can persuade taskbar to go back to seeing 
only one image per open window/application?

Thanks,
Lisi