Problems in VB 4

[kichigaikid]

Hi Guys, I have problems in VB 4 Beta 4. The problems are :

1. When I enter in Admin CP in some menu, like User>Users CP, it appears a dialog box, said that :

A username and password are being requested by http://community.siutao.com. The site says: "Mod CP"I have enter both VB CP and my site cPanel username and password, but I can't still access the page and It says that my username and password are incorrect. But when I didn't put in the username and password, it appreas a page that says :

It seems that you do not have autorization to enter this area.
  
[ http://www.siutao.com/ ]

What's up with this?

2. When I want to skinning my forum, like change the header, and go in Styles and Templates > Style Manager > VB4 Default Style > StyleVars, it appears a page that says :

Your requested file is not available.
 
  
[ http://www.siutao.com/ ]  

3. When I want to change the header image via Styles and Templates > Style Manager > VB4 Default Style > All Styles Options > Image Paths > Title Image, I have input the correct path for the image, but the header image still not change. But in VB 3.x the image header can change.

Can you give me the solution for this?

thanks