In the Reports module, make sure you have View: All selected in the upper left hand corner. See http://screencast.com/t/7j2qswWZn8.
If you have created a report, note that the Category on the report editing screen is be default "General", which means that the report gets inserted into the General subcategory on the reports screen. See http://screencast.com/t/GaTZHBCy and then http://screencast.com/t/2b5197VSb. Please ensure you select the appropriate category and then the report should show up in that category.