Hi,
When you visit 'admin' page, did you find that the website shows a '.tpl' filename on the top of the sidebar? (attached 'before.png')
It did trouble me to find the reason. But finally, I solved that problem. That is what the sidebar should display. (attached 'after.png')
You may find '/admin/templates/core_sidebar.tpl' which is a one-line file. I write the code below.
<div id="sidecolumn"><?php echo $sidebar?></div>
I changed the code into this.
<div id="sidecolumn"><?php Template::Show($sidebar);?></div>
Then the problem is solved.
In order to help more admin, I decide to put the method here. Thanks for your reading.
Webster