Form not sending in Safari now

Dear user, we are inpsecting this issue. Have not received any other request for similar issue.

Safari inspector is showing this error alert as the wheel spins:
<div id="splite_curtain" onclick="splite_unloader();" style="height: 4372px; display: block;"></div>

There’s a thread about this in Stack Overflow –
Stack Overflow CF7 no-attachment fail in Safari
this issue is apparently a result of having file attachment functionality in the CF7 Form.
The fail occurs if there’s no attachment, and only in Safari.

And this in the CF7 support thread. This is not a Slick Popup issue – rather, a Safari 11.1 quirk, and now a known issue.

CF7 topic thread