Sharepoint and PDFs

A Sharepoint site owner has had difficulty opening a PDF on her Sharepoint
site. She has Adobe Reader 7.0 and when she opens a PDF, the screen is blank
until she does a refresh--then the document shows. What could be wrong?

As such, she does not want to put PDFs on her site because she's concerned
others in the company will have this problem. We prefer to only provide her
with our PDF manuals, rather than the originals. Has anyone heard of this
before?

Hi, well we are having no problems at all, but we are using IE 7 and also

Hi, well we are having no problems at all, but we are using IE 7 and also
Adobe reader 8