It may be necessary to open the files in the Reader separate from your browser window.
Large PDF files may take a long time to download over modem connections. If possible, make sure the modem connection is not set to disconnect after a certain number of minutes. (Some commercial Internet Service Providers (ISPs) set such a time limit, but in some instances the number of minutes can be changed by the user. Please contact your ISP for assistance if this appears to be a problem.)
If you encounter problems viewing PDFs, here are some approaches to try:
Also, Adobe has an on-line help page for troubleshooting with Acrobat.
Because PDF files cannot be read by screen reading programs, the use of such
files will generally be avoided at this site except when the original document
is so complex that accurate HTML coding is prohibitive or when a standardized
appearance is desired for the printed document.
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