links on some PDF's

Hello Group:

new to the forum and have been reading some articles on here concerning links. but dont see anything relating to my question.

we do a magazine and we use adobe photoshop CS and acrobat 7 pro to do everything. i have noticed that in some of our things we build thet when veiwing in acrobat the when you hand over some URL's they show the website and some dont. some are even in the same ad that we build. not sure whether it is the part we build in photoshop that is the problem or what. also some ads that the customer builds also dont have the URL's there. i do know that i can use the link tool to add the links whether it is the URL's or e-mail address but im trying to see if we can do something different to save a little time or better yet understand what is making some show and some not. we do do an upload to a service that changes the PDF's to the new flip book format and there software picks up the links on everything except a picture. so that makes me think it is something in photoshop that is the culprit. anyway i can work around it but if i can do something to make it better im al for that.

Thanks!