[jackie_w]

@oddman5,

Try the following:

1. For each occurrence, in the first 4 @font-faces, of
   

   font-family: -ua-default;

   replace with
   

   font-family: "Arial", serif, sans-serif;

2. Unless you particularly want your level-1 headings (<h1>) styled with the font tt0003m_.ttf rather than Arial you can remove the last 2 items
   

   @font-face {
   font-family: "sans-serif1";
   src:url(res:///opt/sony/ebook/FONT/tt0003m_.ttf);
   }
   
   h1 {
   font-family: sans-serif1, sans-serif;
   }

3. Add this extra item after the final @font-face
   

   body {font-family: "Arial", serif, sans-serif;}

It's a bit "belt and braces" but this userStyle.css may handle some epubs that the original didn't.

If it still doesn't work, I'd need to see some of the particular epub which doesn't work.