[snip] I've got a pdf file written from PhotoShop. Using IE to open it gives an "activex warning". Not all pdfs do this in IE, so it's something about this pdf or PhotoShop that is causing this problem. How can I build a pdf that will avoid this alert? [/snip] Try building one using some other software. If that works then you know you have some sort of PhotoShop problem. If not, you have some other problem for which we would not have enough information to solve.