I'm having more issues

It all to do with exporting (to PDF). 

1) Changing the CTB to monochrome fixed the blacks exporting as grey but I also lose some colour with some lines? (not all)

2) When opening the PDF in preview on Mac, 90% of the line work does not display (not an issue, see below)

3) When opening the PDF in Illustrator and saving, all lifeworks is visible in all pdf applications

4) In illustrator hatching have a a lot of strange diagonal lines

5) In illustrator some hatches are 'messy'

6) In any application some lines do not connect/join up.

7) I can't export to PDF after changing something in page setup?

I can send the file but only privately...

Thanks