AJAX requests blocked

Hi guys,
what could block AJAX request?

I have no issue on my computer and all my browsers, however, my client has 2 PC on which the AJAX framework is not working as expected and there is no error in the console.
What is expected is a simple refresh of a partial (data-request-update)

Hi @chris

If there is content injected before the JSON response, it can stop an AJAX request. Check the Network tab to see what the Response shows.

ok let me check with the client, thanks @daft

what are we looking for exactly in the Network tab?

The response contents.