I'm using wordpress.com to host a blog in German (gruebelei.de) and I got a problem with RSS feeds that have mutated vowels ("Umlaute") in their title. The RSS-Widget seems to be unable to interpret these characters. I doublechecked with the authors of the feeds (one is a wordpress.org blog) and they say their feeds match UTF-8. There's no problem with these feeds in other RSS-readers, only in wordpress' RSS widget.
Any ideas how to solve that problem?
The blog I need help with is gruebelei.de.