Report Parameter Working for one Report, but not Another

We have several MS Reporting Service Reports at my company that were using a parameter that I’ll call “Person”.  We display the reports on our ASP.NET Website and when a report is selected that needs the Person parameter we show a Person DropDownList.  For some reason this was working fine on several reports, but not for a new report.  We verified through the Reporting Service interface and by looking at the actual parameter data in the database that everything looked correct.  The Person parameter for the non-working report was identical to the working report.  We wasted a lot of time looking for a solution as to why this wasn’t working and eventually figured out that we just needed to reverse the orders of the parameters in the non-working report.  For some reason the Person parameter needed to be the last parameter instead of the first parameter.  Hopefully this helps if someone else runs into this issue.