ernee
commented
4 years ago @ShihTzuRescuer thanks for reporting! I'm not able to replicate the issue using the SG Optimizer plugin, but I'm curious if there is something with your site's configuration that is involved.
1) In your site settings (under Settings > General from the Dashboard), could you share the WordPress Address and Site Address present when the issue occurs?
2) Also, could you confirm when viewing the Web Stories dashboard if the site is showing as serving over the https://protocol?
ShihTzuRescuer
See screenshot. 
austintude
LuckynaSan
Bug Description
When we pick any of the templates, we are getting the error "unable to create story from template the response is not a valid json response", or the page fails to load and we get a blank screen.
Expected Behaviour
Template loads upon selection for editing as needed.
Steps to Reproduce
There appears to be conflict with SiteGround Optimizer plugin, specifically the "Fix Insecure Content Enable this option in case you’re getting insecure content errors on your website. We will dynamically rewrite insecure requests for resources coming from your site"
We have turned off this option and the templates work as expected now.
Screenshots
Additional Context
Upon troubleshooting, SiteGround suspects that "Web Stories plugin is making a request to a non-secure URL, which our SG Optimizer tries to redirect to its secure version. However, the secure version of the URL is most likely returning an error, which is why the request can't be properly serviced."
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Acceptance Criteria
Implementation Brief