We currently have the educator theme installed and has been working fine
What I did was change a few parts in the css, then cleared the theme cache.
and now its lost the stylesheet, so I went back into the css and revert the changes.
Since then, I redownloaded the theme, as I thought it was the theme issue but I can happily copy this theme and put it on my test box (same moodle version 2.5.3+ (Build: 20131115) )
So then found turning on theme designer, the theme comes back OK, but if I turn it off, the stylesheet(s) disappear.
I already tried uninstalling the theme, purging cache several times, clearing theme cache.
any suggestions on what it could be ? or to try next?
I feel there is something broken in the moodle files somewhere