Warning: Undefined variable $usermarkersfilter in…

Good morning,
Since the migration from Joomla 3.10.11 to 4.3.1, maps no longer display KML tracks or elevations.
Error message :Any idea what is causing the problem?
Thanks for the help

Hi
It is warning and don't cause not displaying map

Can you give direct link to your page with map.
For track with elevation you need to set KML (Internal parser) or GPX (Internal parser).
I can't tell more without map page. Check browser console for errors.

Hello,
Curiously, the error message only appears in local development

Online, there is no such error message.
On the other hand, the KML route and the contour lines are not displayed, neither locally nor online.
Here is a link

I checked page

Here console output
 

As you can see by security policy Google Maps API blocked, therefore you can see google not found error.

Check your server/site/apache settings why it is blocked

Indeed, there was a bad setting of the key on the Google Map site.
I just corrected that.
However, this key setting error did not prevent the display of paths in KML format with the old version 3.10.11 JOOMLA.
It is since the migration to version 4.3.1 of JOOMLA that there is this display defect, and the anomaly persists despite the patches concerning the Google Map key.

Hello,
 
Confirmation, after a multitude of tests: the ZhGoogleMap j4-13.23.5.3-final version no longer recognizes KML files in the "Path" tab.
 
Elevation curves are not processed either.
 
A solution please,