Hi there
I noted the problems you were having and went to have a look for myself on your site, testing in different browsers, and it didn't appear to work with any (Firefox, Safari, or even Chrome).
So I wanted to double-check that the patch with the fix had been applied correctly.
I installed a special plugin that displays in the admin toolbar which Toolset plugin the common code is coming from (it's called Toolset Common Status).
That showed the common files are being supplied by the Views plugin.
I don't have FTP access, so I added the Filester plugin to be able to apply the patch, but when I uploaded the file I'm not sure what happened as it has produced a fatal error on your site.
Without FTP access I can't fix the problem.
So—first—sorry that happened, you'll need to fix that error yourself using FTP.
Please simply delete the Views plugin (plugins/wpv-views).
I expect that should restore your site (minus Views).
Then install this version of Views on your site (upload via the Add New plugins page): https://toolset.com/patches/wp-views-patched.zip
Clear your browser cache and test editing the content templates again.
If you still have the problem, please confirm, and I'll take a copy of your site to investigate further, I want to get to the bottom of why the fix is working on our own test sites but not your site.
You can delete the Toolset Common Status and Filester plugins.