I am having the same or a similar problem, but refreshing doesn't help. This is a fresh installation of 2.5, using SQL Server. Here's what I observe:
Dashboard information appears correct, the public pages appear correct. If I make a change to the database using Management Studio, it's reflected on the public pages.
Blogs tab is empty.
Posts tab is empty. When I try to add a new post, there is no response.
Categories displays correctly, and I can add a new category
Tags is empty (there are entries in be_PostTag)
Blogroll - able to delete entries
Users - empty, not able to enter a new user
Settings - not able to save changes, but if I make a change to the database using Management Studio, it's reflected here.