Second tab top left tile should have no bearing on this, as that's only used in areas where there's no other B-E tile used. The bookshelves ARE on the B-E tabs, so the passage settings on those tiles is what will be used.
I would be very interested in hearing what the problem/solution actually was.
Well, to risk myself further embarrassment, I'll explain.
I opened a project I hadn't worked on in a few months. I had already created the maps a few months back, but I never set the Walk/Don't Walk tags on the individual tiles. So today I went in and set them. I couldn't seem to grasp why it was still letting my character walk over the tiles that I had clearly set. I tinkered around for a while, but still couldn't think of any plausible explanation. That's when I posted the topic.
Then, after posting, I realized that I had two different tilesets, very similar, but with a different E tab. The one where I had set the Walk/Don't Walk tags is the one I had been using for all of the maps I created today. I didn't realize the map that I was working on was using a different tileset.
So really, no problem what-so-ever. I'm just an unobservant dolt.