Jeff, thanks for the fast response!

I did what you said and deleted all cookies (google and application).
But that did not change anything.

Additonal information about how I use your plugin:
I added a little script in the header before your code:
var gaProperty =’UA-xxxxxxxxx-1′; // xxxxxxxxx used here for demo purposes
var disableStr = ‘ga-disable-‘ + gaProperty;
if (document.cookie.indexOf(disableStr + ‘=true’) > -1) {
window[disableStr] = true;
}
function gaOptout() {
document.cookie = disableStr + ‘=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/’;
window[disableStr] = true;
alert(‘Tracking by Google Analytics was disabled for your browser Browser on this website.’);
}

The gaOptout function is called, when the user clicks the “disable tracking” link in the privacy notice (you might have heard about GDPR becoming effective May 25 😉

Checking with the JS Console (breakpoint after reading the cookie) proves there is no “windows” property ‘ga-disable-UA-xxxxxxxxx-1’ defined in ‘windows’, which proves the cookie was reset.

Nevertheless the same effect:
The asyc call does not work because ‘js?id=UA-104766607-1’ in ‘https://www.googletagmanager.com/gtag/js?id=UA-104766607-1’ results in “failed to load response data”. I’m not sure if this simply means the promise as result of the ascny call returns -1 or if the statement is not accepted/executed at all. What might result in not tracking anything at all, even if the user did not opted out.

I might have to go back to the alternative “old” tracking method; unless you have an idea and can help.

Sorry for all those details, but I wanted to provide everything I found out so far 😉

Regards
Hans