I have spent some time testing the automatic population of the URL field when manually creating a new product in different locations and with different browsers.
It turns out to be a local issue with IE in our Server 2012 r2 Essentials network. Firefox works OK but IE does not complete the URL field from the product description.
I think I am right in saying that the server software controls the security settings on the IE browsers within the network so that might be the issue?
Not a big issue, just an annoyance, so we will use Firefox instead.
Thank you for your feedback.
I cannot reproduce the problem
Please have a look
Do you have JS errors on the product_modify.php page?