I used FTP to check your error logs and saw a fatal error relating to dynamic sources with your template.
I suspected the problem was with an issue that we should have a fix for in the next release of Blocks, namely when a template is edited it has assigned a post that is used to preview the template as it is being built. If the post being used for the preview is deleted while still assigned to the template it can cause errors.
I confirmed that was the case on your site (I installed a plugin temporarily to be able to directly inspect the database tables), and removed the assignment.
That has fixed the issue, you can now edit the template.
As mentioned, the underlying issue will be fixed in the next Blocks update.
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