Hello,
I believe that I have noticed the same issue as the original post, but I think that the description could have been misunderstood.
I have a site that supports en-US and de-DE. When I log onto the site with either firefox or Opera and then click on one of the solpart menu items (e.g. HOME) I can note that there the language is not present in the URL address. If I do the same in IE or netscape the language is clearly listed. If I switch languages then the language reappears but goes away when clicking on another solpart menu link.
Actually, this is what happens on your site as well. For example, just looking at this page (in English, and language en-US is visible in the URL) I can click on the HOME menu link and the language disappears.
Of course all of my content is still switching as expected. So you may be wondering why this is a problem.
I have been trying to implement the PageBlaster module but the caching system gets messed up if firefox is used. It would be great if there was a fix to this.
BTW your localization solution is great.
Best Regards,
Scott Peterson