>In my app I have a viewer based on the Acrobat Reader ActiveX control. The machines I have installed my app on has the AcrobatReader 4.0. All was working great until AcrobatReader version 5.0 was installed on a machine. Now I can get an initial picture pulled up but when I try to select another picture from a list I get a fatal error. Please help!

Take a look at Thread #459779.
In case if you wouldn't be able solve this problem there's another way to display PDF file on the form. See Message #569965.