Text is dissapearing when outputting a .PDF

Hi, I've got this problem where my text is dissapearing when I export a .PDF from PS. Some of the text dissapears and some is white with a thin outline (although it should just be solid black). I've read other things online from people with this problem but none of the solutions work for me. If I rasterise the text it works - but i don't want it rasterised.

- I'm not using Faux Bold or other effects

- I've tried with different fonts including Arial and Helvetica

- Tried changing the colour slightly

- Tried changing opacity slightly

- opened a new document with only text and it still does it.

I think it is only happening when i use a text box (dragging the text tool to make box rather than a single click)

I've got Creative Cloud and PS is up to date. Working on a rMBP  OSX10.8.4

Any help most appreciated!