Quote - I already asked for this, and was told to use Ctrl-Shift-B to toggle the library, which works indeed just fine.

oooOOOOOoooohhh! Very cool, Thanks! It seems lots of things are "togglable"

Quote - No, not this, but I had it leave when I tried to add a Blinn node. Restarted, reloaded the scene and this time it worked just fine, so apparently it's random.

Random.... bummer.

Quote - Do your P7 scenes load in the right dimensions? Mine load in whatever aspect ratio the last preview window was in, even if it's undocked, which is an obvious bug. I expect my scenes to load just like I had saved them.  :-/

Hmm... most of my scenes have non-preview sizes and those DO load in with the right dimensions.  If you've only changed the preview size to change the render size, then yea, I can see how P8 would read that as your new preview size.  Can you undock the preview window?  I guess a work around would be to go back into P7, and change the render dimentions to an exact resolution, even if it is exactly the preview size and save it again before you load it into P8?  (probably already been stated).