PDF Export corrupt

Hi,

When I export to PDF I get corruption in the fonts. All capital 'E' letters have an extra line closing the right side of the character to form a box.

On screen it is fine, printing is fine. I can print to PDFFactory and it will come out fine (but digitised).

I'm using the 'STANDARD' font.

Edit : I've attached a sample .DWG and .PDF

Is this a bug or something I am doing wrong?