This can happen if you are using the Acrobat browser plug-in rather than downloading the PDF to your hard drive first. -Follow the instructions at the top of the Technical Document Library to download. Or you can disable the Acrobat browser plug-in by removing it from your browser plug-ins directory.-Using the browser plug-in with large Acrobat documents will often cause problems such as being very slow or even freezing the browser. The reason is because you are accessing a large document on a remote server rather than locally.