I can’t edit my theme? Says failed to load page?
Hmm, this is not the first one today.
Does it happen with any theme or just some?
Looks like its happening a bit https://community.shopify.com/topic/2826678 - Are you still having problems?
This has been a problem in Chrome for a number of weeks now but don’t think it’s theme specific (all works ok in Firefox). Shopify Support will ask you to clear cookies and reset browser which as we know is a pain as it clears all logins etc across all sites. But even doing this will find the problem return either hours or a few days later. All works ok in Incognito Mode so probably is a cookie problem or something but having the time to track down which one is difficult.