WordPress 3.0 Problems

I have installed WordPress 3.0 but I’m facing two problems.

1. I cannot add new tags to my posts anymore. I can see the tag box but when I type a new word or phrase in it the “Add New Tag” phrase does not disappear. When I click Add nothing happens.

2. If I click the “Add an Image” button which exists in the “Upload/Insert” line on top of the editing box of the posts, I do not see a pop up dialogue box. Instead the insert image page replaces my editing page. I can then upload images but it does not insert the image in the post and it never returns back to the page that I could edit images.

BTW, I use the latest version of mozilla FireFox 3.6.6.