Pagination using query strings - url problem

[eluser]BobbyB[/eluser]
Hello,
I am trying to get the CI pagination working and have following problem.
I set everything up according to the user guide but the url looks like this:

Code:

http://localhost/test/index.php/paging/display/&per_page=5
//Notice the & instead of ?

I found antoher thread from a guy that encountered the same problem:
http://ellislab.com/forums/viewthread/143280/P15/

Any idea what the problem might be?
Thanks in advance!