If you are talking about css stylesheets, you have to create a MIME type, i am unsure if Rejetto has created a default css MIME type in these latest builds but i had to create one to test new things on my latest template builds.
I had this same problem when hosting websites i have made at university that use css stylesheets, It just would not load the css no matter what i did.
Below is my guide to create a MIME type for stylesheets (e.g. style.css):
menu > other options > MIME types... then make a new one that is *.css | text/css, hit apply, then i found closing then re-opening HFS made it work.
Rejetto is this in the latest build? (i cannot tell because i saved my settings with this applied)
If not would it be possible for you to put this in as a default setting?