feed won’t update in bloglines

This is my RRS2 feed: http://www.divaknitting.com/blog/?feed=rss2 It seems to be updating in some cases, but specifically not on bloglines. I tried updating permalinks (not sure why this would help, but there seem to be quite a few feed/permalink related posts) and also installed the feedburner add on to redirect all feed requests through them…that didn’t seem to help either. Any ideas on what might be causing this?