So I upgraded my 4.4 site to 4.5, which went smoothly, but try as a I might I can't find any way to set access permissions on a node-by-node basis, either per-user or per-role. There's nothing in the handbook about it (or, rather, I can't find anything about it in the handbook). Searching the forums leads to references to an external module "node_privacy_byrole", but all those references seem to predate the release of 4.5.0, and the release announcement for 4.5.0 clearly mentions "Node level permissions".
I never had any trouble with this before, but I had trouble adding an Adsense block in 4.5.0. If anyone else has had problems, all you have to do is set the block as PHP. Since you don't have to enter the tags, you can just paste the code into the block. Nothing else worked for me.