My b2evolution Version: Not Entered

I have an error with the blog. Using latest 2.4.0-rc2

I click archives (in the sidebar)

Then I click March 2008 (Or any other date)

Then I get this error:

CGI Error
The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are:

Any ideas?

I changed the archives from "Use extra-path" or "Use Params" and that seemed to fix it, but why does it not work the other way?

Jason