I have a custom field for a youtube link that I want to enter in the sourcecode like so:
When I go to save the template I get a page is not working message. If I reload the template i see that it has saved my change.
So, somewhere after the save it is crashing and I suspect it is due to the ? or & in the link.
Please send me your wp admin details at firstname.lastname@example.org so I can check it at your end.