I can only tell you what I see.
Your Photopost is completely integrated with
vb fine. It shows the admin button and your logged in with Photopost and
vb but when you click the admin button you need to login again.
There are many threads on this and the only issue this can be that I know of is the fact the cookie prefix or license number are incorrect.
Now do a test undo that very restrictive login thing you have for
vb and see if things work properly