Hi Mou,
I have updated the pheed also and it has not updated yet.

But as Kurt has said above that blogger will look for updates on our pheeds in a day (or maybe longer) and then we will be able to see the changes that we have made.

As to the invalid feeds. I also had that. I was using the rss converter and created the feeds,but got the invalid feeds "error message".

I had to check the option where rss converter where it would strip html tags for strict rss syntax.
So maybe that's the problem that you are having. Strip the excess html tags to get a strict rss syntax.

Hope this helps.
bye,
faraz