Muse disables in browser editing of synchronised text

Question

I check the box in page preferences "Engable in Browser Editing"
I also check the box "Enable for synchronised text
Fasthosts, is running PHP 5.4 (and the documentation states 5.1 for in browser editing of synchronised text).
And every time I upload the site, it tells me it's switched off the synchronised text editing.
Why would this be?
The site is this below. There's a phone and a desktop version with shared text.
http://www.theretroagency.com
HELP!

Answer 1

This message will appear and InBrowser Editing of Synchronized Text will be turned off if/when Muse finds it cannot update the .htaccess file for your site during the upload process.
Synchronized text relies on the use of .php for the pages of your site that include synchronized text. This means that one or more of your existing .html pages would change from being mypage.html to mypage.php. That change would break external links to the page and potentially impact SEO. Therefore Muse will put information into the .htaccess file so mypage.html works as the name for mypage.php and external links and SEO are preserved. If Muse finds it cannot write updates to the .htaccess file, then it doesn't use .php for any of the pages of your site and your page file names don't change. However, that means updating synchronized text via InBrowser Editing isn't available, since it requires .php pages.