[plumstripe]

I'm not looking at this through a url, I'm looking at it through webmaster mode in admin panel.
So I don't believe the cache issue is relevant

But just in case, I have also run the admin panel on the test store in a new incognito browser window so the cache issue is not relevant.

The problem is not my browser, it's that x-cart isn't allowing me to revert theme_tweaker changes I made that broke the 'order processed' screen

it's a copy of the store I was experimenting with, but had this been the live store we would not have been able to use the store, or had to use a backup copy.

Theme_tweaker changes should be reversable and in this case it wasn't. A file was shown which seemed to be the one I changed, but when I tried to edit it, x-cart said it couldn't be saved, or didn't exist.

I'm assuming that is a bug!