White Horizontal Lines

[missykitty7]

Hi,

I have thin white horizontal lines across the pages of some PDFs

This does not happen when I open the same PDF in Adobe or Foxit.

Supposedly this issue has been raised before, and fixed.
Can anybody fix this for me?

I am using build 47.0

Thanks,
Josey

P.S. -
I have not provided the PDFs in question as they are lecture slides from my university,
I will try and find other occurrences if proof is necessary.

[John - Tracker Supp]

OK - and please provide an example as it is also very difficult to investigate without being able to reproduce.