This is a very weird problem, I can not find out the cause:
On Joomla 3.5.1, I installed Gantry5, then installed RT Salient template, then I go to "Extensions -> Template Manager -> RT Salient default", and on the style settings page, there will show a 5 digit string on the top of that page, just below the top menu, on the left.
If I check the source code of that page, the random string is before the HTML tag "<!DOCTYPE html>", that is to say, the random string is at the very beginning of the source code!
I thougt that was a template related problem, then I installed Hydrogen template for test. The same problem happened.
Howevr, on other template settings page, this problem does NOT exist.
The most weird part is: I made a full backup of that website and then restore the backup on my XAMPP localhost testing server, it works fine, the random string does NOT appear.
Maybe this is a problem only related to that server, but I want to know the exact reason.
So please help me to find out the cause.
Attached is the screenshot to show two points:
1. left arrow: the 5-digit random string, if you quit template manager and enter again, that string will change, but refreshing will not change it.
2. right arrow: if you click on "Page Settings" , it will not open, just wating ....
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Thank you.