When downloading a portfolio, the navigation links point back to the server, rather than pointing to the local file system. For example,
<a href="http://nightly2.sakaiproject.org:8082/osp-presentation-tool/viewPresentation.osp?panel=presentation&id=802C754F27876834B529DC6153FE37BC&sakai.tool.placement.id=7b02297d-a25d-4b56-983e-058d4cd05e36&secretExportKey=AA3FB1D5C4BC02135175F73FAC1F4A89#page_About">About the Project</a>.
In addition to the problem portfolio, I have attached a matrix and portfolio template for duplicating the problem. In the matrix, you only need to fill out one form in one cell, "Final Presentation and Evaluation".