Running a hierarchical workload report (type "Resource, Category, Project, Component, Issue" for the period Dec 1/10 to Jan 4/10, for one developer in pretty format (i.e. 1 week) for time units), I can see the hierarchical report fine.

When I click on Excel View, then "Open", I get an error in a Window with "Microsoft Office Excel" in the title bar, and "The file you are trying to open, 'ConfigureReport!excelView[1].xls', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?" With buttons "Yes/No"

Choosing Yes at this stage results in an error with "Problems During Load" in the title, and in the body "Problems came up in the following areas during load: Missing file: C:\download\resources\jira.plugin.minyaa.core:MinyaaCSS\minyaa.css" With buttons "OK/Cancel"

Pressing OK does bring up the report, but it's a winding path to get there. Thought you should know.