rss-feed: netvibes ok, feedburner no

hello,

i am having problems with my feed. actually i thought it would work perfectly, since it is displayed at netvibes, bloglines and so on, integrated into a blog-planet and so on. i can even take a look at it using firefox 2 after clicking the link.
but there are problems with i.e. 7 and last but not least feedburner, they wouldn’t accept or even find it !

my questions now are:
– how could i edit my feed template to solve these problems?
– what is the problem anyway ?

i later recognized that several other blogs seem to have the same problem: displayable at firefox, integrateable at netvibes, but not to be found at feedburner.

my blog url is: https://dissidenz.olifani.de

thanks for answers !
??