Found out today that after a few hours of searching that there is a bug in the version (CMS 5) of EPiServer we use in one of our projects. When using additional querystring parameters one should turn of the caching of EPiServerFriendlyUrlRewriteProvider, with this row in web.config:

<add name="EPiServerFriendlyUrlRewriteProvider" description="EPiServer standard Friendly URL rewriter" type="EPiServer.Web.FriendlyUrlRewriteProvider,EPiServer" friendlyUrlCacheAbsoluteExpiration="0:0:0" />

This bug has been fixed in CMS 5 SP1, so it might be a good idea to upgrade

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