>>>>Press F12 and depending of the browser debug the script.
>>>>First see if you have any error messages in console.
>>>
>>>Thanks, that was going to be my next question: how to debug this :)
>>>
>>>This error is showing:
>>>
>>>

jQuery.Deferred exception: a.indexOf is not a function TypeError: a.indexOf is not a function
>>>    at r.fn.load (http://localhost:51730/jquery-3.1.0.min.js:4:18717)
>>>    at HTMLDocument.<anonymous> (http://localhost:51730/AboutUs.aspx:13:23)
>>>    at j (http://localhost:51730/jquery-3.1.0.min.js:2:29568)
>>>    at k (http://localhost:51730/jquery-3.1.0.min.js:2:29882) undefined

>>>
>>>Of course, that isn't very helpful to me :(
>>>
>>>Google here I come
>>
>>Can you send me this project?
>>Of course if this is something you play with :-)
>
>This is actually a client's system which uses DevExpress controls so it will be difficult to send to you. I could let you access my PC using Team Viewer though :)

.load() has been deprecated. Check :
http://stackoverflow.com/questions/37738732/jquery-3-0-url-indexof-error