Bug on Google Reader

I use Google Reader every day.
google-reader-bug

Look, the red 1, 2, and 3 all point that I have 7 new items. The 4 tells me:

Your reading list has no unread items.

I do have no new items in my list. Even I chose show all, and go through every item. I saw they are all gray. That means read already.
I try to refresh the Firefox, or restart the Firefox. Not work. I use Firefox 2.0.0.1, the latest version of Firefox.
I tried it under IE 6. Same.
This is a bug of Google Reader.
If you have same problem, let me tell you how to solve it.


google-reader-bug-solve
First, click show all. Then click mark all as read.
Now, the incorrect new item number is gone.