Safari wont open .pdf files. Is here a setting that interferes?

On my iPad using safari, and, with firefox on my iMac, I con open .pdf files on our club web page. However with Safari I only get a black blank when I try to open them on my iMac with Safari. FireFox works fine . Could there be a setting on Safari that is not allowing pdf files to open?

Here is the web page link. http://www.lhmac.org/lhmacnewsletters.htm

the same pdf files when e- mailed to me open fine on my iMac.