Updated to v6.9.6 and now when I view orders in the admin the page is all messed up. It doesn't show orders and formatting is all bad. Site is live so this is important. Can you help?
Had to switch back to old ectcart.css and now it's back to normal but not sure what else is messed up.
ectcart.css controls the view on the "front end" of the website only. You say it's the admin that you have a problem with. It sounds likely to me that it was just a cache issue and you just need to force a hard refresh. ctrl>F5 will usually do that.