Did try both Firefox and Chrome and both freeze. Maybe a conflict with a plugin I am not sure. I do have Akeeba Admin tools added but disabling that didn't make any different. But if it to do with htaccess that it is creaeted disabling it won't effect it.
Working on a couple of sites. The site that cause the freeze is https://www.sweetenings.co.uk
Is very odd as I can display a custom block in the position on the tempate anywehere on the page excpt the sidebar. The page is clearly using the template option but the side bar is missing. I also noticed that there are 2 instances of Taxonomies: Product Categories in the assignment panel. I have set on for both.