I upgraded to 2.5 a couple nights ago. This problem may have existed before then, but I think I would have noticed it.
My web address: http://www.smalltownsentiments.com
My problem is that when you click any of the months in the archive, or if you click what should be a permalink or if you click a category name it doesn’t actually do what you want it to. It changes the address in the address bar, but you have the same view you did previously (most recent entries). Using the search bar also takes you back to the same ‘main’ page.
Is anyone else having this trouble since updating to 2.5? Is it a problem with the theme possibly? I generally keep the same theme, I just change the colors and the header. I did try changing it back to the default theme, and the problem still exists.