Hey,
The case below is my personal story on this matter:
I designed a Press kit (PDF with linked icons or sentences) for a client; all links worked but one link!
I've tried to seek help anywhere- no one seems to know the problem.
Thanks to my partner, I was able to fix it - It amazing how little this fix was!
My text setting was in all caps mode, so when I copied the link, it pasted it in all caps. wow
When I changed it back, the link worked.
So that is guys- I hope my story will help you.