Templater Creator 3.3.19 doesn't save

I upgraded from TC CK 3.3.18 to 3.3.19.
Now, Template Creator CK doesn't save neither new templates nor the modified ones.
If I try to create a new template, it appears within the list. Then I try to configure it, but every time I try to save it, the page with the templates appears, asking me to choose one from the start.
This happens only with one site ( www.b-b-santagostino.it ) and not with another one directly built with 3.3.19 version ( www.ristrutturazionigorgonzola.it ).
I can't figure out what is the problem.
It seems as if TC CK isn't able to write the correct info in the /components/com_templateck/projects folder, which remains empty.

Hi
this is probably a conflict with another plugin installed into your website.
Try to unpublish all additional system plugins that you have installed and test to see if it works
CEd

I checked: no plugin conflict.
Instead, I realized that the problem is due to the modified .htaccess file. I restored the old version of this file and now everything works well again.
Since the .htaccess file has not been created (nor modified) by me, I don't know which is the rule that affects Template Creator CK, but I will investigate.
Thanks for your support.

ok let me know if you find something

I have a clean install of Joomla 3.4.1 and also to impose a template (version 3.3.19) in version 3.3.18 everything is ok. Have you ever figured out what it is?

So I found that the problem is with Firefox, Chrome is OK.