Hi,
I've checked on our end and the cron task is running fine:
Connection accepted to the host :
www.bijouxdelou.com
: 80
at 26 May 16 14:02:09
=> Result of the trigger at 26 May 16 14:02:30
HTTP/1.1 200 OK
Date: Thu, 26 May 2016 11:44:13 GMT
Server: Apache
X-Powered-By: PHP/5.3.24
Set-Cookie: d996b725e17f3c61a2eacdffd9494a14=a83aed57d4f8660870d2768e180fad79; path=/; HttpOnly
Vary: Accept-Encoding
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html
a1
<div class="alert alert-info alert-block"><button type="button" class="close" data-dismiss="alert">�</button><p>HikaShop Triggered at 2016-05-26 19:44</p></div>
Note that the waitlist plugin will send emails only if you have customers who entered their emails to be notified and that you put back some stock for the products. I don't see another reason.