majestixx

Just to add:
The same applies to Autoptimize. If JS-Optimization is disabled, the map is working again.

I have the same Issue.
The Problem is caused by lines 252-254 in wp-gpx-maps-admin.php:

<!-- The First Div (for body) ends in the respective file for the corresponding tab -->

This comment is added to all ajax request and results in parsing errors.

I agree ??
But finally I found a working solution! With just rewriting the .htaccess.

For other users with the same issue. Here is my working .htaccess:

RewriteEngine On
RewriteBase /blogs/
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*)$ $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

I changed the RewriteRules from absolute to relative paths and now it works like a charm ??

Unfortunately is my hoster not even able to tell me which value is set for allowOverride.

Are there any alternatives?
I assume the not working rule is the third from the bottom. This does the redirect for any files in the WP directories.

Do you have any idea why the subsite “test” is working at all? Doesn’t that mean that the second rule from the bottom is working?

Accordings to you problem: “33c958” is a random subdomain.
as a ping to 33c958.milkywaydigitalmedia.com fails it seems that the wildcard dns entry does not work.

What is a wildcard DNS? https://en.wikipedia.org/wiki/Wildcard_DNS_record

You are not seriously posting you db user and password in a public forum?