Well, I did check it out ... it also troubles my collapsible categories (not all browsers, not all versions)
yesterday: downloaded and install rc1. (adjusted minor things as in profile layout (h1, h2 and so on, no code, just tags)
was happy, then realized collapsible categories was not displaying raquos/laquos but \xBB instead ... firefox 3.07 right now. IE 8 fine but drops them on 7+
realized than on external blog that feed reports an error.
Es gab einen Fehler, vermutlich ist der Feed nicht verfügbar. Bitte versuchen Sie es später noch einmal.
Only new thing was: rc1.
So feed blog to my own site. /with compare external blog as well.
Others work, mine didn't - error.
Deactivated rc1 ... feed comes back on
Actived ... feed reports an error (there is a lag though)
So, left deactivated ...
Today went for stable release ... same issues - so yes, I think there is some sort of unwanted interaction somewhere. I am not a programmer so it is hard for me to know where to start to look.